Corrected entry: Near the beginning when he takes his car and puppy to the gas station in New Jersey, he would not be allowed to pump his own gas.
Corrected entry: Francis the doorman in the red club is played by Kevin Nash, former WWE wrestler.
Corrected entry: When John is at the gas station and is being harassed about his car, one of the gangsters calls his car a 1970 Mustang Boss 429. John corrects the year as being a 1969, however the car used in the film is actually a Mustang Mach 1.
Correction: This does not change the fact that his car is a 1969 model, as he states.
Other mistake: When John is talking to the club bouncer, John says that he lost weight, to which he replies (in Russian) "Twenty kilograms." The translation says "over sixty pounds," but 20 kilograms is just over 44 pounds. (00:46:30)
Suggested correction: Maybe he's actually saying "Over 20 kilograms" in Russian. If you calculate the other way 60lbs is just over 27kgs.
Logically that doesn't make a lot of sense since the mistake is saying the translation says "over 60 pounds", so we have to assume by 20 he means over 27.6. Why not just just say "over 27 kg"? And you appear to just be guessing that maybe he says "over 20 kg" in Russian.
Watching it literally right now... he absolutely says "20 Killogramma".
Character mistake: When he called for a dinner reservation for 12 at his home it should have been 13, as he put 13 men down. (00:32:05)
Suggested correction: Actually 14.
It's possible he simply miscounted in the heat of the moment. I'm not saying you're wrong was John doesn't seem like the type to make this sort of mistake but it could be let off as a character mistake rather than a movie mistake.
A character mistake is a valid movie mistake and this entry is listed as such.
Corrected entry: When Miss Perkins "visits" John in his room at the Continental she shoots through the glass headboard to his bed. It repairs itself several times during the following fight scene. (00:59:00)
Correction: Just watched the scene again. All the fight scenes show the shots through the headboard. The headboard shown not shot is in Harry's room.
Correction: Alfie Allen also wouldn't be allowed to smoke at the gas station. Clearly the employees at this gas station are not enforcing the rules.