Other mistake: Before Uncle Owen yells for Luke, if you look very closely, a fly can be seen on the lens (best seen on the special edition release). The fly was removed in the 2019 release.
Other mistake: After talking to his own mirror image when guarding his house from the "Heffalumps and Woozles", Pooh turns around counter-clockwise. This should mean that his mirror image would turn clockwise but it ALSO turns counter-clockwise. (00:35:55)
Other mistake: When some of the team is visiting Lupus, there is a picture given to Lupus of him catching a long fly ball in his glove from the first movie. However, the picture taken was up close and there is no way a picture that close could have been taken as nobody with a camera was anywhere around him on the field when the catch was made. In addition, nobody expected him to catch it, so the close up picture is not possible in reality.
Other mistake: When Bilbo is looking at Thror's Map, he says "This hand points from these runes," but there are no runes visible where the hand is. Later, Elrond reads the Moon Letters that appear there, and says that they say, "Stand by the grey stone when the Thrush knocks, and the last light of the setting sun will shine upon the keyhole." But the Moon Letters actually translate to "Five feet high the door and three may walk abreast."