Factual error: The scene in Eddie's bedroom takes place in 1977. The Cheryl Tiegs poster came out in 1978. (00:12:12)
Continuity mistake: When the girl in the red swimming costume is being carried to the car after ODing, she has less blood on her face then when she was lying on the floor in the bedroom. (00:39:45)
Other mistake: The doughnut shop customer's gun was pointed upwards and away from the doughnut shop employee's head when it fired. (02:04:37)
Continuity mistake: At Rahad's house, Todd puts a gun in his belt. It is not visible as he walks up the steps to the house, is visible as they go to greet Rahad and then it is not visible for the rest of the scene until Todd pulls it out to shoot Rahad. (02:08:20)
Revealing mistake: In Dirk's first sex scene with Amber they are both supposed to be naked except for their shoes. At the end of the scene Amber sits up on the table on which they had sex as a female stage hand wraps her in a robe, and you can see she is wearing black panties.
Factual error: While Dirk and Reed are running from Rahad's house, and trying to get into Dirk's 'Vette, Rahad fires a shotgun at them. One shot hits the driver's window, which shatters, then a shot at the back of the car showers sparks. Corvettes are fiberglass-bodied, and wouldn't spark. After the sparks, there is no damage to the rear bumper cover, which if really hit with a shotgun blast would at least put some holes in the fiberglass.
Factual error: At the 'Goodbye 70's/Hello 80's' New Year's Eve party, Reed Rothchild asks Todd Parker if he got off work for the evening. Todd responds, 'don't dance Sunday nights.' Unfortunately, New Year's Eve (12/31/79) fell on a Monday that year.
Factual error: At the end of the movie in the pickup truck, You can see a sign for "Rent-A-Center" in the background. The sign is the new logo of the company, At the time when this was set the colors of the sign should have been brown and yellow.
Continuity mistake: When Dirk, and Reed are buying clothes, they walk up to the wall, and look at a pair of shoes. Reed is on Dirk's right. On the next shot, Reed is on his left.
Continuity mistake: When Buck is covered in blood during the doughnut scene, first he just has blood on the right side of his suit. When the angle cuts, his whole suit is covered in blood.
Continuity mistake: At the recording studio, before Burt talks about Catch-22 he swaps from leaning against the door, arms crossed, to several inches ahead arms raised.
Factual error: In the scene where Dirk Diggler and Reed Rothchild work in the recording studio to cut their record, Dirk sings a song called "The Touch." However this particular song did not actually come into being until 1985 when Stan Bush wrote and recorded it for use in "Transformers: The Movie."
Continuity mistake: Dirk tells his girlfriend "Everyone's blessed with one special thing" and she has her head up, elbows on the mattress. A frame later, her head and back are resting on the mattress.
Visible crew/equipment: After Amber shows Dirk the documentary, Jack's on the phone and a lighting screen reflects on his glasses.
Continuity mistake: When Dirk and Jack first meet, the kitchen towel to the left of Dirk keeps changing positions between shots.
Continuity mistake: At the pool party, when the guy is crying about the OD'd girl, the coke moves further away from his knee between shots.
Continuity mistake: At the diner Horner is listing all the costs of making a movie while Amber sits against the chair, left arm relaxed. Angle cuts, and she is leaning forward, hand next to her mouth.
Chosen answer: SPOILER ALERT: It was the 1970's. Loose morals. The era of free love. Little Bill and his wife were active in the porn industry. It's likely that his wife presumed, but never discussed with her husband, an "open relationship." Bill, stunned by his discovery (but, perhaps, suspecting it all along), was simply trying to maintain his composure and not seem pathetically unhip by what would be perceived as an absurd overreaction. Clearly, however, he was suppressing a great deal of internalized rage. Ultimately, but very calmly as always, he eventually shoots and kills his wife and her gentleman caller mid-coitus, and then eats his own gun, at Jack's New Year's Eve Party, 1980.
Michael Albert