Corrected entry: Around the very beginning, while the chipmunks are storing nuts, Alvin gets fed up and starts to stomp on the tree. The wood cutter is heard louder and louder and Theodore says, "You guys, I think he made it angry!" ('He', referring to Alvin.) However, he said 'guys', meaning he was talking to both of them, including Alvin. It wouldn't make sense if he had told Alvin, "I think he made it angry," referring to Alvin.
Phixius
15th Apr 2008
Correction: I've heard similar in actual conversation. Even so, this is a character mistake at most. Or perhaps he said, "You guys" to get their attention, then, in a split-second decision, decided he wanted to tell Theodore that he thinks Alvin made the tree angry. Either way, this isn't a movie mistake.
Phixius ★