When George is leaving the apartment after asking Melody to marry him, he picks up three presents; by the time he reaches the door he has only two.
Towards the movie's end, Ted goes into the TV room and eats a carrot. A few seconds later, when he is seen leaving the room, he still has the carrot in his hand.
In the movie they infer that Bellevue, Washington is north of Seattle and that it is in the country. Actually, Bellevue is just across Lake Washington from Seattle and is the second largest city in King County.