Many animation fans have noted the design style of the characters in Eight Crazy Nights is similar to the design style of the characters in The Iron Giant (1999). The majority of the animators that worked on this film were laid off from Warner Bros. Feature Animation (which produced The Iron Giant) and Fox Animation Studios.
Originally, Sony Pictures did not want to participate in the animation game with the expense and risks involved, but Columbia chief Amy Pascal greenlit this movie anyway on a personal pitch from Adam Sandler himself.
According to Doug Walker, Seth Kearsley sent him an e-mail following Walker's review of the film, revealing that Kearsley wanted certain scenes cut from the film, but they tested well with audiences and were not cut as a result, specifically noting a scene involving deer and feces. He also noted that test audiences hated the voice of Whitey, but they did not wish for the voice to change.