Incorrectly regarded as goofs: When Steve tracks down Mary in the park, you can see their breath, even though it is supposed to be June. However, at night in San Francisco, it can get that cold.
Revealing mistakes: After Mary and Steve knock the statue over, they lift it back into place far too easily for the limestone it's supposed to be made of. It also makes a hollow sound, as though made of fiberglass or plastic.
Revealing mistakes: Wire can be seen between torso and extended arm of figure when Mary and Steve are shopping for statues.
Continuity: In the park, there's a tight shot of Dr. Edison flicking the "non-brown" M&Ms out of his hand. When it cuts back to a medium shot, the yellow and orange ones are back in his hand.
Errors in geography: A taxi journey from the Golden Gate Park to City Hall would not go via the Presidio. It's clearly more dramatic for the movie if they get stuck in a traffic jam with a beautiful background, but there is a much shorter way to get to city hall.
Factual errors: The invitation to Fran & Steve's wedding shows "Saturday June 6th 2001" as the date, whereas June 6th 2001 was a Wednesday.
Audio/visual unsynchronized: In the scene with the falling statue, as Mary and Steve pick it up, Steve's mouth does not move with the words that he is supposed to be saying.
Continuity: When Mary's shoe gets stuck in the manhole cover, the same red car comes toward her in several of the shots and the distance changes with each one.
Incorrectly regarded as goofs: At the beginning, Fran's full name is said to be Francine, but the wedding announcements show Frances. But Frances just like Fran is a nickname for Francine so it could go either way.
Continuity: At the dance studio, Matthew's shirt is wet in the middle of his back, but in the next shot, it is not.
Incorrectly regarded as goofs: After Steve saves Mary and Mary's subsequent hospital stay,Steve tells Mary that he only treats pediatric patients. In the same scene, Steve checks Mary's blood pressure with an adult blood pressure cuff when a pediatric pressure cuff should be the norm, as it is a children's hospital. However it is a hospital and of course would have adult equipment around. A child's arm cuff would not work properly on an adult arm.
Continuity: In the wedding scene at the beginning of the movie, all of the guests at the wedding rise when the bride is about to go down the aisle. Two girls, who happen to be sitting, notice Mary. Everyone around the girls are sitting also. In the next shot, everyone in the church is standing because the bride is going down the aisle.
Continuity: When Steve rescues Mary from the dumpster, they fall to the ground and Steve catches her head with his left hand. In the next few shots, his hand jumps from underneath her head to a hand either side of her head.
Continuity: When Steve, Mary and her assistant meet in the part, they are eating M&Ms. Steve is eating one after the other, including yellow and red ones, even though a few minutes later he is throwing out the coloured ones and explaining he only eats the brown ones.
Revealing mistakes: When Mary and Eddie are looking at statues, when they are trying to push it back to place you can see the wire pulling it up.
Factual errors: After the dance lesson when Fran says Eddie will have to take off work on Friday to go inspect the vineyard as a possible wedding site, he says he can't because he has a diverticulitis seminar. It would be highly unlikely that he would be attending such as seminar if he was a pediatrician since diverticular disease is uncommon before the age of forty.
Continuity: After Mary gets examined by Dr. Steve, Penny arrives in his office without a coat. When she leaves, she removes a coat from the rack.