Blooper

Lisa orders a pizza that is "half Canadian bacon with pineapple, half artichoke with pesto, and light on the cheese." The half-eaten pizza seen later is a plain cheese pizza.

Freshly-lit candles are beside the bed during the second love scene. However, Johnny and Lisa had been drinking for several hours before they went upstairs, and they were supposed to be so drunk they could barely stand.

In the first love scene, Lisa takes her hair out of a clip. In the next shot, it's back in the clip. In the next shot, it's out again.

The wine glass moves in and out of Lisa's hands.

Denny is eating an apple while Johnny and Lisa are upstairs. Denny climbs the spiral staircase with the apple in one hand. In the next scene, Denny climbs to the top of the stairs without the apple.

When Mark and Johnny are on the roof, Mark recalls a tale of a "Girl who got beat up so bad she ended up at a hospital on Guerrero Street". While there is an actual Guerrero Street in San Francisco, there is no hospital.

At the coffee shop, Johnny, Mark, and other customers don't pay for their orders at the counter. However, as Johnny leaves, Mark says to him, "It's on me." Presumably, at this shop, customers are supposed to pay before leaving. Mark is not shown leaving.

The pistol that Chris-R uses to threaten Denny is clearly a BB gun, as evidenced by the hole in the top for the BBs, and by the circular plug in the butt for the CO2 cartridge rather than a rectangular opening for a magazine.

However, Chris-R does not fire it, and he effectively uses it to intimidate Denny; he may have deliberately carried an imitation firearm for this purpose, perhaps due to its easy availability, or in an attempt to escape prosecution if he were caught carrying it (carrying a real pistol is a serious crime in California if the person lacks the appropriate license or has a felony record).

During Johnny's rampage, when he knocks over pictures on the fireplace, the closest picture falls and leans on the camera.

The second love scene includes several obvious shots from the first love scene.

When characters leave the roof via the stairs, they turn left. However, the stairs can't go anywhere because of the layout. This is best highlighted when Mark leaves the roof.

All of the living room furniture in Johnny and Lisa's apartment is positioned in such a way that obscures the view of the TV.

The TV that Johnny throws through the window hits the ground straight down, which is impossible given the angle at which he throws it.

When Johnny parks his car outside the flower shop, one of the people walking past looks directly at the camera and waves.

In the end credits, there is credit given to a "Barista #2", but there is no mention of a "Barista #1"

Carolyn Minnott's surname is misspelled "Minnot" in the closing credits. (It is spelled correctly in the opening credits).

Running up the steps, Mark says "Really, that's great." without his lips moving.

When Mark and Lisa rush to put on their clothes after someone knocks on the door, Lisa can be seen speaking, but there is no audio. When she says "Hurry up!" a few seconds later, it doesn't match her mouth movements.

On the rooftop, right after Johnny says "Oh, hi, Mark", Mark says, "Oh, hey, Johnny, what's up?" However, the camera cuts to Mark just before he says "what's up", and his mouth is not moving at all.

When Johnny greets Lisa during their first scene, parts of the studio can be seen behind the door as he closes it.

At the coffee shop, Johnny and Mark agree to meet each other "in Golden Gate Park." Golden Gate Park comprises a whopping 1,017 acres; real San Franciscans arranging a meeting in the park would agree upon a specific part of the park, e.g., Peacock Meadow, Stow Lake, the Murphy Windmill, the Conservatory of Flowers, or the Japanese Tea Garden.

Mark asks Lisa "what's going on" with "the candles [and] the music", but neither music nor candles are present.

Johnny claims that he couldn't cash a check because it was "out of state." However, it is entirely possible to cash an out of state check. Johnny, a banker, should know this.