Not sure if this discussion has been brought up before.
An American Tail was horribly tampered with when it made its first showing on DVD. Unlike the VHS release which appeared to be the theatrical release, the DVD version was altered quite a bit.
There are noticeable changes in sound effects, music was retract, new voice overs added, and one of the bully mice was re-recorded by another voice actor.
I suppose it was a Lucas reimagined hack job. But don't know for sure. All I do know is the DVD version of An American Tail is unwatchable because the changes are so distracting.