Factual error: When Dave hears the message on his voicemail from Claire, telling him that she will be round for dinner at 7 o'clock, he checks the clock and it is 6:30.p.m. However, bright sunlight is pouring through the windows. This film is set around the countdown to Christmas, so at 6:30p.m it should be pitch black outside, or at least slightly dark but definitely not bright sunshine. (00:30:50)
Factual error: When the Chipmunks are going on tour and all of the cities are listed, it says that they're going to "Phoenix - NV" however it's clear they are in Arizona not Nevada, so it should have said "Phoenix - AZ." (01:02:40)
Answer: No it isn't his voice.