Continuity mistake: Just before Gussie leaves Mickey O'Hare's wake, Fievel can be seen in the background behind Honest John eating a large piece of cheese from a nearby teacup. However in the next shot he's standing in a completely different location and no longer has any cheese in his hands. (00:40:05)
Continuity mistake: After Gussie Mausheimer walks out of Mickey O'Hare's wake, Bridget asks to speak with Honest John regarding Fievel's family. Pay attention to the attendees in the background who are gathered around Mickey's picture: they keep disappearing in every other shot throughout the remainder of the scene. (00:40:20)
Continuity mistake: 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. (00:41:10 - 00:43:15)
Continuity mistake: During the rally at Mausheimer Park, Fievel steps up to the podium and whispers a plan into Gussie's megaphone. When Honest John asks to hear it, Gussie can be seen holding the megaphone's handle with three fingers as she speaks to him. But once the shot changes, she suddenly has only two fingers on the handle. (00:45:20)
Continuity mistake: When Fievel is running after Tony in the back alley, he gets stuck in a sewer grate hole and hears what he thinks is Papa's violin coming from down below. Throughout the scene at some points, Fievel instantly appears in different grate holes. (00:48:20)
Continuity mistake: When Fievel is making his way through the sewer looking for Papa, he enters the Mott Street Maulers' hideout where five cats are seen playing poker. The gray cat with a blue shirt is sitting on the carpet's edge, but in the next shot he's somewhere towards the middle instead. (00:49:25)
Continuity mistake: In the scene where Fievel walks in on a group of cats playing cards, Tiger slaps down his hand and yells "Rummy!" But once he gathers the cards and holds them up again, there's a 3 of Diamonds visible - which wasn't part of the original hand to begin with. (00:50:00)
Continuity mistake: In the scene where Tiger and his friends are playing poker at a round table, the leader (who says "Ante up, boys") is seen wearing a different colored shirt between shots. At first it's purple, but in the close-up shot it briefly changes over to black. (00:50:25)
Continuity mistake: When Warren T. Rat is playing his violin off-key, there's a female statue behind him adorned with candles, and at first glance it seems to be in good condition. But after Fievel witnesses Warren T. shedding his rat disguise, the statue is now significantly cracked in many places. (00:50:40)
Continuity mistake: When Warren T. Rat is playing the violin off-key, he hits a bad note and blames his fake nose for getting in the way. With the bow still in hand, Warren grabs his nose and proceeds to twist it off. But the bow vanishes in the next shot as his nose snaps free. (00:50:50)
Continuity mistake: When Fievel discovers that Warren T. Rat is actually a cat in disguise, the hat tucked into his black belt disappears between shots. (00:51:20)
Continuity mistake: When Warren T. Rat grabs Fievel from behind the glass, his hand has a grip around Fievel's blue pants at first. But as soon as the shot changes, Warren T.'s hand is gripping bare ankle instead. (00:51:25)
Continuity mistake: After Fievel sinks his teeth into Warren T. Rat's left arm from behind a mirror, he howls in pain. In this shot, the reflection of Warren T.'s teeth isn't reversed like it should be. (00:51:25)
Continuity mistake: When Tiger and his pals are tearing apart the poker table in search of Fievel, watch the lower right corner of your screen. At some point during the commotion, one cat drops his gray hat and it vanishes into thin air. (00:51:35)
Continuity mistake: When Fievel is struggling to avoid the other cats on the player piano, Tiger appears on its right side and pounds the keys, just missing him. But Tiger instantly disappears from his location in the very next shot where Fievel jumps up to the music rolls. (00:51:55)
Audio problem: When Warren T. Rat calls open season on Fievel, the cats all scramble at once to capture him. In one shot where Fievel is running from either end of the piano, he jumps upon the same key twice. The notes play, but the key never goes down at all. (00:51:55)
Continuity mistake: In the sewer where Fievel is trying to evade the cats - at the point where he's on a roller skate heading downhill into the path of a live bear trap - several notches on the skate's belt disappear between shots. (00:52:10)
Factual error: When Gussie Mausheimer is pointing to a map and outlining the secret weapon plan, east and west are switched on the compass rose. (00:52:55)
Continuity mistake: When Gussie is demonstrating a secret weapon plan for the other mice, she points to a world map, pushing a small wooden boat from the end of a dock all the way to Hong Kong and leaves it there for the remainder of her speech. After she's finished Gussie dismisses the mice, but now the boat has returned itself to the original location on the map. (00:53:20)
Continuity mistake: After Gussie outlines a secret weapon plan to get rid of the cats, she walks over to the clock and moves its hands to 6:00. But right before the scene ends, the hands are positioned at 5:00 instead. (00:53:40)
Answer: Warren T. grabbed Tiger and told him he was fired.Tiger did eventually leave some time after that though.