Disqualification of Belarus Two days after "
Ya nauchu tebya (I'll Teach You)" was announced as the Belarusian entry for the contest, the EBU ruled that the song did not comply with the contest's rules against political entries, and that the song was not eligible to compete in the contest unless it was modified or replaced. After failing to meet an extended deadline for submitting an eligible entry, with their second submission "Pesnya pro zaytsa (Song About Hares)" also being found to not comply with the rules, it was announced on 26 March 2021 that Belarus was disqualified from the contest. Pavlenko took a
COVID-19 PCR test, which came back negative the following day, allowing her to perform again. Van Stijn received positive reactions for her performance, in particular for her pronunciation of the Ukrainian lyrics, and was invited to sit with the Ukrainian delegation in the green room during the first semi-final.
COVID-19 infections zone was set up outside Rotterdam Ahoy during the Eurovision event weeks. Ahead of the "Turquoise Carpet" event, one member of each of the Polish and Icelandic delegations tested positive for COVID-19. As a result, those delegations were absent from the event, having gone into self-isolation in accordance with the contest's health and safety protocols. The Romanian and Maltese delegations were also absent from the event on a precautionary measure, as they were based in the same hotel as the Polish and Icelandic delegations. All other members of the Polish and Icelandic delegations tested negative, and remained in quarantine until the jury show of the second semi-final. However, it was later confirmed that a member of the Icelandic group
Daði og Gagnamagnið had tested positive, and as a result, the group withdrew from performing in the live shows. Footage from their rehearsal at Rotterdam Ahoy was broadcast instead during both the jury show and the live show of the second semi-final; this footage was also shown in the final. On 20 May, the EBU confirmed that
Duncan Laurence had tested positive and would not perform live in the final. He was due to perform his winning song "
Arcade" and his new single "
Stars" during the interval, and present the points on behalf of the Dutch jury; the latter role was filled by
Romy Monteiro. Pre-recorded rehearsal footage of Laurence's interval performance was broadcast instead during the final. Due to the positive test result, Laurence was also not present to hand over the trophy to the winner; the presenters handed over the trophy instead.
Technical issues Jury show issues During the jury show of the first semi-final, the Romanian, Ukrainian and Maltese delegations reported problems with their performances; most notably,
Roxen was heard to be off-beat with the chorus of her song "
Amnesia". The EBU later confirmed that
in-ear monitoring issues had occurred and that all artists involved would be given a second chance to perform. No issues occurred during the second performances. During 's jury final performance, the rotating platform did not stop when it was supposed to, leading
Senhit to have to jump from it while in motion. The Sammarinese delegation later filed a complaint, also claiming that all the camera shots were distorted due to these timing issues. The delegation offered to allow Senhit and
Flo Rida to withdraw from the event, though they ultimately decided to stay. The contest's executive supervisor,
Martin Österdahl, apologised to the delegation and reaffirmed that the issue would be addressed moving forward and that they would be protected to the highest degree.
Camera breaking prior to Ireland's performance During the setup for 's performance in the first semi-final, a camera broke, which caused an extended delay after the postcard was shown. Co-presenter
Chantal Janzen improvised in the green room during the live broadcast to fill in the time.
False allegation of drug use During a green room segment in the final,
Damiano David, lead singer of the Italian band
Måneskin, was claimed by some online viewers on social media to be seen snorting a line of
cocaine when leaned over a table, although there were no drugs in the footage and the singer was sitting away from the table, close to the Italian delegation members. In the band's press conference following their victory, Torbjörn Ek, a journalist working at the Swedish newspaper
Aftonbladet, asked about the allegations, which David denied by suggesting that fellow member Thomas Raggi had broken a glass which David was picking up off the floor, going on to say "I don't use drugs, please guys, do not say that." The band later released a statement on their official Instagram account, stating: "We are really shocked about what some people are saying about Damiano doing drugs. We really are AGAINST drugs and we never used cocaine. We are ready to get tested, cause we got nothing to hide." The EBU released a statement the following day, stating that the band, their management and the Italian head of delegation had denied any allegation, and the singer in question, Damiano, requested to be tested the same night, but as testing could not be immediately organized, he would "take a voluntary drug test after arriving home". It was also confirmed that "broken glass was found after an on site check". The allegations were mostly covered by the French press and briefly commented on by the French foreign minister
Jean-Yves Le Drian, but the French participating broadcaster announced that it wouldn't file any official charges, while in the Italian press, it was described as a social media joke that had gone too far and become
fake news. On 24 May, the EBU released a statement confirming that no drug use took place in the green room during the final, following a negative drug test and inspection of all available footage. The EBU also expressed concern over "inaccurate speculation leading to fake news [that] has overshadowed the spirit and the outcome of the event and unfairly affected the band."
Dutch televoting issues The EBU confirmed on 24 May that it encountered issues regarding the Dutch televote in the final. Numerous Dutch viewers complained on social media about their votes not being counted and had only received their confirmation texts hours after the show. The EBU later confirmed to
NOS that those votes were not counted due to a problem with the
Dutch branch of the telecom provider
T-Mobile, while clarifying that it had no authority over the issue. The Dutch televoting results, therefore, remained valid. == Reception ==