The most drastic changes were shown during the season 1 episode "Looniversity Daze". This has caused the Fox retakes to fall into obscurity, and it is unknown if master tapes containing the retakes still exist. While many errors were fixed during subsequent Fox airings, they resurfaced in the master tapes that were sent to Nickelodeon. This lead to noticeable animation quality differences between episodes and many errors.
Tiny Toon Adventures episodes were outsourced to a wide range of animation studios, such as Animation Korea Movie Productions (AKOM), Tokyo Movie Shinsha (TMS) Entertainment, Wang Film Productions, StarToons, Kennedy Cartoons, Freelance Animators New Zealand, and Encore Cartoons. This was a constant problem when Tiny Toon Adventures was pulled from Fox and moved over to Nickelodeon in 1995. However, this problem can also occur when a show moves from one network to another if the master tapes that are sent still contain the early mistakes. This had been fixed in later television airings, but the DVD release was taken from a master tape containing the unfinished version. The season 1 episode 'Howl's Bayou' had been aired in an unfinished state, with a background missing from one scene. A particularly infamous example was seen on DVD releases of Captain N: The Game Master. This results in errors resurfacing that had been previously fixed.
This confusion is made worse when the studio neglects to update their master tapes with the animation fixes, and then these outdated tapes are used to produce home media releases. If the fixed version is available for subsequent airings, this can lead to confusion, as the subsequent airings will differ from the original airing. While retakes are generally ordered to fix the errors, they may not arrive in time, and the studio is stuck with the error-riddled version for an episode's original airing. These errors are commonly caused by translation mistakes when the animation work is outsourced to foreign countries. Sometimes, when an animated TV show is being produced, animation errors are found too late to be fixed before the intended air date.