When Alan is drinking the "Old Walmart" bourbon that Charlie gave him, the bottle cap is sitting next to the bottle, on Alan's left side. In the next scene, the cap has moved to Alan's right side, then it moves next to the bottle again.
Charlie, narrating an embarrassing moment to Jake, says he didn't notice the Adam's Apple of a supposed girl and Jake replies, "Girls don't have Adam's Apples". That is not true: both sexes have them, but the size increases considerably during puberty in the male body.