Continuity mistake: Sarah wears her ring on her right hand. However as Sarah begins to climb the ladder in the tunnel after she answers, "You're right," when she puts her right hand on the rung above her, the ring is gone, but it's back in the following shots. (00:37:15)
Continuity mistake: The band-aid on Jill's doll disappears and reappears several times.
Continuity mistake: When Seymour tries to kill the plant he pulls a gun, the gun is a six shooter, the plant grabs the gun and fires at the guy, then he fires some more, in total the plant fires 9 shots with a six shooter...
Continuity mistake: When Tiger and Fievel are doing their musical piece, Tiger wipes off the mirror and they appear the same size. When he lays out in front of the mirror, singing the line "We'll be there to pick each other off the floor", he places his head next to the cage bottom, still laying on the floor between them. In the mirror, however, that cage bottom is not reflected at all. (00:57:30)