When Anne and Gilbert race to the bridge and he falls in, he comes out all wet. Moments later, when they encounter Fred and Diana, he is dry.
When Morgan proposes to Anne outside in the courtyard, the snow only falls on Anne.
Anne's first day of school, she goes to the blackboard to write her name and the chalk breaks. There is nothing on the board. But after she closes the door, there is a streak of chalk which she supposedly wrote before the chalk broke.
When Anne is preparing to go to Diana and Fred's engagement party, there is a red giftbox on the table. Rachel gives it to Anne as Anne leaves for the party. But in the last shot of that scene, the box is back on the table.
At Diana's wedding, when the minister's wife is singing under the tent, it is clearly raining outside. However, when it cuts to the guests outside at the wedding, it is not raining anymore.
At the beginning of the movie when Anne is on the beach and the pages start flying away, all the pages are the same.
When Anne and Diana are in the cabbage field trying to catch the Jersey cow, it is supposedly in the early- to late-morning. However, in one shot, you can see the sun setting behind them and hear the evening crickets in the woods.
After Anne exits the post office and we first see Gilbert, there appear to be power lines in the background. You can see them to the right of the screen when Anne rips her letter out of Gilbert's hand
When Jane Andrews introduces Anne to her fiancé Harry Inglis, and Ruby Gillis irritates her with a comment on her big shiny ring, Jane turns to Harry and says, "Let's go, Harry." However, if you look closely at her lips, she is clearly mouthing out, "Come along, Harry."
As Diana and Anne walk past the house, as they talk about Anne's story and right before running into Rachel with the Jersey cow, you can see crew trailers, a yellow car with its hood up and some other equipment reflected in the windows of the house (best seen in the window at the end).
During Anne's first class at Kingsport Ladies College, she does not yet know Essie's name when Essie faints, from the horror, of Jen Pringle's snake, that was secretly put in Anne's desk, and has to leave the room. After Essie returns to the room, Anne refers to Essie by her first name.
When Gil comes across Anne and Diana in the mud, he says "Rolling Reliables" instead of "Rollings Reliable."
When Marilla reads the dedication page from Anne's book, the text of the dedication is shown on-screen; and although it states "...and to Gilbert...", Marilla "reads" "...and for Gilbert...".