Audio problem: When Randall is shooting cannons and saying, "I love this job!" her mouth isn't moving.

Ice Age 4: Continental Drift (2012)
1 audio problem - chronological order
Directed by: Mike Thurmeier, Steve Martino
Starring: John Leguizamo, Queen Latifah, Denis Leary, Ray Romano, Aziz Ansari
Revealing mistake: When Scrat removes the giant acorn in Scratlantis the city is immediately flooded. Everyone in the background is blown away by the sudden rush of water. However, both Scrat in the background and Scrat's host (slightly off-camera) in the foreground don't move and don't seem to be affected by extremely strong flow. (01:18:50)
Granny: Don't worry about me. I survived the comet that killed the unicorns.
Trivia: The knife that is given to Louis by the pirates is the exact same knife that Buck had in the previous film.
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Answer: It's probably just a very similar one.