Production started in October 1990 in order to meet the scheduled premiere in August 1991. After
The Ren & Stimpy Show was approved by the network in September 1990,
Spümcø hired new animators in order to kick off the series' production. Most of the people whom
John Kricfalusi hired were artists who had previously worked with Kricfalusi on
The New Adventures of Beany and Cecil in 1988. Painter Teale Wang recalled in 2009 that Kricfalusi had an unorthodox way of recruiting artists, as she stated that, in early 1991, "John offered me a full-time job, but I told him I was going back to
The Simpsons. He looked at me and said, 'oh, I get it. You like it safe. You don't like to take chances. I understand'. I got so pissed off, I told him to fuck off and that I'd take his job! I was actually shaking. He knew exactly what he was doing. I only knew him two weeks, but he had figured me out in two minutes". In its early days, Spümcø was described as more as a "mom-and-pop shop", and not until the first months of 1991 did the studio operate more like a conventional animation studio. Much of the episode was drawn by Kricfalusi and
Lynne Naylor, co-founders of Spümcø. Naylor simplified the design of Ren and Stimpy from their look in their debut in the 1990 pilot episode "
Big House Blues" under the grounds that it took too much time and was too expensive to draw the characters in frame by frame as was done in style of the "Big House Blues". In "Big House Blues", Ren and Stimpy had an "underground" look that was gone by "Stimpy's Big Day!". Naylor argued that a simpler design was needed to save money and time. This was especially the case with Ren as he was notoriously difficult to draw properly, and many cartoonists have failed at drawing Ren. Naylor's redesign of Ren and Stimpy became the norm for the rest of the show, though Kricfalusi has expressed preference for the original look of the duo in "Big House Blues". Production was greatly hindered when Naylor broke up with Kricfalusi in March 1991, after which she left
Spümcø and would not be involved with
The Ren & Stimpy Show until after Kricfalusi's firing. Working on "Stimpy's Big Day!" imposed serious strains on their relationships as Naylor was far more committed to reaching the deadlines imposed by the studio than Kricfalusi (a factor that contributed to his later firing by Nickelodeon). David Koenigsberg of Spümcø recalled: "She was building up with all this tension because she felt the deadlines much more oppressively than John did". Koenigsberg recalled that the other animators would laugh and joke while working, but Naylor "was like the uptight librarian reminding everyone 'we have to go back to work now'. She was serious, it was not a joke. I remember talking to her one day about how we should laugh at this, and she really couldn't". Naylor had completed the layouts for "Stimpy's Big Day!" when she broke up with Kricfalusi. However, despite the break-up, Naylor played a major role in "Stimpy's Big Day!" as she drew the opening scene where Ren criticizes Stimpy for watching cartoons too much, which established a dynamic that continued for the rest of the show. Both Kricfalusi and Naylor had been born in the 1950s, and as result the couple set "Stimpy's Big Day!" sometime in the 1950s as a tribute to the world of their youth. Despite this, in the episode itself, one of the prizes listed for the winner of the poem contest is "a 12-hour record set of the top hits of the 70s." The work of inking and painting both "Stimpy's Big Day!" and "The Big Shot!" was done at
Lacewood Productions in
Ottawa. The studio had a hostile working environment, paid its employees poorly, and its output was subpar. Despite Kricfalusi approving of their work, the studio backed out after the first season. ==Reception==