Continuity: During the Cornell/Harvard hockey match, before Oliver enters the penalty box, his hockey jersey is almost spotless. After he sits down and takes off his helmet, a large blood smear appears on his jersey near his shoulder.
Revealing mistakes: When Jennifer calls on the phone Oliver's father , the number she dials is 1-333-334.. (not in the visible frame), but the number Oliver told her to dial is 1-3383434.
Revealing mistakes: When Oliver is playing in the Harva'rd-Dartmouth game, the crowd is chanting "Go Leafs Go". The chant is obviously dubbed from an National Hockey League game in Toronto's Maple Leaf Gardens.
Continuity: When Jenny phones Oliver's dad to decline the birthday invitation, Oliver is wearing a different pair of jeans than he is wearing in the next shot when he runs in the streets looking for her.
Crew or equipment visible: When Oliver and Jennifer pull up to his house to meet his parents, the shadow of the camera can be clearly seen on the wheel and hood of the car.
Continuity: In the hospital scene towards the end, Jenny's hair on the left side of the pillow keeps changing position every time the camera angle changes, although she herself has presumably not moved.
Continuity: Camera shadow on street and car when they are talking about naming the baby Bozo.
Continuity: When Oliver talks with Phil at the hospital, his hand suddenly appears on Phil's shoulder.