In the first scene, Mike's answering machine disappears after he listens to his messages and then calls Trent. And later his base disappears
During the diner scene when Trent jumps up on the table, Trent can be seen in the reflection behind Mike taking his shirt off. When we cut back to Trent he hasn't taken it off yet.
Mike's double-downed bet is visible before he places it.
While Trent tells the story of his audition, Mike and the Judy Garland impersonator are holding hands, but not in her close-ups.
When Mike is looking at Lorraine across the bar towards the end, her drink changes back and forth from a dry martini to what appears to be a cosmopolitan between shots.
They say they are playing NHL 94 and that this is the one where you can make the opponent's head bleed, but this was in NHLPA 93 and not in the 94 version.
Although the guys all lament the fact that there is no fighting in the version of video hockey they are playing, that version is NHLPA '93, which did, in fact, have fighting (as well as being able to make someone's head bleed). Fighting was not removed from the series until NHL '94.
When Mike buys $300 in chips at the casino, the dealer counts the bills and hands him three black $100 chips. They are identical to standard poker tournament chips used in most casinos around the country and clearly say "No Cash Value" on them.
When Mike is holding the wheel while Trent is changing into his suit in the car, a shot of the car swerving from the front reveals the driver's right and left hand on the wheel making it swerve.
The messages that Mike leaves Nikki at the phone machine do not last the same, even though Mike is always being cut off by the machine. However, it is revealed that Nikki has been listening all along and was stopping the machine on purpose.
When Charles first meets up with Mike and Rob in the bar, you can see Mike mouthing the line about Star Trek: Deep Space Nine (1993) at the same time Charles say it.
When Mike is sitting up against the wall, he casts a shadow towards the window (which is the dominant light source).
Camera shadow on Mike's back when he and Lorraine are dancing.
As Mike, Trent, and Sue enter the Derby through the back staircase, the camera crew is reflected in the shiny light green wall, and the crew's shadow falls on Sue's back.
In the first scene in Mike's apartment, the first time he walks into the kitchen, you can see a crew member reflected in the glass of the left kitchen door.
In the last of the scenes in Mike's apartment, when the camera zooms in on him while standing in the kitchen and talking on the phone, a portion of a light stand can be seen behind him in the final moments of the zoom.
When Mike and Trent pull up to the hotel in Las Vegas, you can see that they are pulling up to the Stardust Resort & Casino, which is located on The Strip. However, once they're inside the casino you can see that the blackjack tables bear the name of the Fremont Hotel and Casino, which is based on Downtown Las Vegas.
When Mike is on the phone with Michelle.
Boom mic visible at bottom of screen when Mike and Rob are talking at the party in the Hills.
In non-widescreen versions of the film, the shadow of the boom mic is visible during the desert road scene (Trent in the foreground, Mike sitting in the car), in the lower left-hand corner.
In the trailer Trent says the part he was auditioning for was called "Brother". Then he says the casting director said "Trent when you walked in the room, I didn't see Trent Walker come in here, I saw Big Brother come in here." Then he says the director said "I think you're a little old for the part of Brother."