Continuity

In the cab, on the way to the hospital, Mollie shouts that her water just broke and James looks back apparently seeing a mess, but when she gets to the hospital, her overalls are perfectly dry with no evidence of her water breaking.

Character error

Mollie's blind date stresses the importance of a Notre Dame football game on TV by saying "it's the playoffs." In 1989, Notre Dame participated in Division I (now the FBS), which had not yet incorporated a playoff system.

Anachronisms

At one point, Molly is in the streets with Mikey and we see a Starbucks Coffee in the background. Starbucks did not make it to the east coast until the early-1990s.

Crew or equipment visible

When James is driving Molly to the hospital, they pass a window and you can very obviously see the camera sitting on the hood of the taxi.

Revealing mistakes

When Molly and James are in the airplane and he's telling her to "take his stick", you can see the wall of the hangar behind them during the front shot.

Crew or equipment visible

In the far shots during the chase scene at the end it is obvious that the driver and passenger in the taxi are Travolta and Alley's stunt doubles.

Plot holes

When James goes to Mollie's apartment to return her purse after Mikey is born, James says to Mikey, "How you doing, Mikey? I'm James." How did he know his name was Mikey if Mollie never told him?

Continuity

James introduces himself to Mikey and he shakes his hand with his right hand. In the next shot James is shaking Mikey's hand with his left hand.

Continuity

James carries a sleeping Molly to bed. When he first picks her up, her hands fall on her chest. However, in the next shot, her arms are wrapped around his neck.

Continuity

When Molly is dressing Mikey for his first meeting with Albert, she asks him what outfit he wants to wear. In the shot with him saying neither, he is already in the white lamb overalls.

Revealing mistakes

When the channels are being switch by a remote control from a football game to a snuggle's commercial, the channel number stays at 03.

Crew or equipment visible

When James is driving Molly and Mikey to pick up his grandpa, they pass several windows that reflect the camera and crew on the other side of the taxi.

Crew or equipment visible

During the very last scene James and Mikey go to a hospital to see Molly. While walking into her hospital room you can see it's obviously a set/sound stage when you look up at the top, in the corner(s), you will see it for a few good seconds.

Continuity

When Molly is in the hospital talking to her baby through the glass about finding a father, she is only wearing 1 earring.

Continuity

James' sunglasses while driving around looking for the missing child.

Continuity

In every shot of Mikey in his high chair except the very last one (the dance sequence), the background dishes in the drainer with the towel tossed over the counter can be seen to be exactly the same.

Continuity

During the chase scene at the end of the film the windows in the taxi are down during close-up shots and up during long shots.

Continuity

The mess made during fight between Albert and James is different in every shot.

Continuity

When Mikey hops in the car being towed and thinks he's driving, the front door was still open, but when the car is seen being towed away, the door is closed.

Continuity

When Molly is cleaning excess chocolate off Grandpa's face, the box of tissues keeps changing.

Continuity

After the fight with Albert, the red table that the phone was on had nothing on it. When Molly came home, the section of the room was trashed in a complete different way with trash on the red table.

Continuity

When James and Albert fight, the flower falls from the table twice.

Continuity

When Molly starts hitting James for taking Mickey out without permission, he falls knocking a box of Cheerios which hangs curiously over the counter and has a plastic glass standing upright untouched. After he has removed the splinter, we see the box gone and it is replaced by the same plastic glass fallen down and it's contents spilled over.

Continuity

James attempts to light a cigarette in Molly's apartment to her disgust. However there is a sign displayed in his cab that states the driver is allergic to cigarette smoke.

Continuity

After Mikey finishes making the statues fight, the small statue on the back is leaning one way, then in another shot it's leaning the other way.

Continuity

When Mikey is making the statues fight, a ball breaks off of one of them and rolls on the shelf. When Molly fussed at him and he asks "What did I do?" the ball is gone.