Continuity: 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.

Continuity: Watch the small bed inside the water tower. Soon after the song (Somewhere Out There), a small piece of cloth appears from nowhere on it.

Factual error: When Fievel arrives on Ellis Island, and the pigeon is telling him that America is bigger than the island they're on, they're standing on the Statue of Liberty's flame. The French gave the arm holding the torch to America in 1876 as a gift to commemorate America's centennial. The arm holding the torch was actually a monument standing in Central Park until the statue was shipped to America and finished.

Factual error: In the scene where Fievel is being dressed by the pigeon there are two American flags in the background. The flags have too many stars for the mid 1880's, when the movie is set.

Continuity: When Fievel is first heading down the storm drain, as he believes his father is playing his violin, he leaves his hat on the surface, but a few seconds later he is seen holding the hat as he gets closer to the gang of cats.

Other: In the scene when Fievel And Tony reunite on the streets of New York, Tony gets a piece of cheese off of a mouse trap. Watch that piece of cheese, cause Tony throws it up in the air, and you never see it come back down.