Continuity mistake: When Will tosses the envelope with money on the table, it moves away/closer to the stack of papers, depending on the angle.

Rise of the Planet of the Apes (2011)
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Directed by: Rupert Wyatt
Starring: James Franco, Andy Serkis, Tom Felton, Freida Pinto
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Dodge Landon: Get your stinking paws off me you damn dirty ape!
Trivia: Don't leave when the credits roll. There is a scary snippet you don't want to miss.
Question: I'm no expert on apes so can someone tell me if the conversation in sign language that Caesar has with the orangutan is possible? We know that apes can be taught to sign and hereby communicate basic concepts and identify objects. But the orangutan, which has not had the benefit at this point in the film of the mind altering drug, communicates that humans do not like smart apes and, by extension, it has kept its ability to sign secret. This is complex behaviour that requires the ape to understand human motivations and decide to deceive its captors. Is this possible?
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Answer: It's not necessarily a sign that the orangutan understands human motivations. It could be, and probably more likely *is*, a sign that the ape has shown its intelligence previously during its stay in the habitat, was abused by the humans as a direct or indirect result, and was subsequently conditioned to play dumb.
Phixius ★