Incorrectly regarded as goofs
Once Jim arrives back to his Dad's home it is clear that its not the same house from the previous films. The walkway is different along with the yard layout. Also the house next door is no longer brick as it was in American Wedding. However, it's been 3 years so Jim's dad may have relocated (moved) since then.
[16:10]When all the guys meet in the bar, Selena shows them the YouTube video from 1999 with Jim dancing for Nadia on her smart phone. This isn't the actual video from Jim's web-cam, which is in the corner of the room. She used footage from the first American Pie movie itself, which is not possible.