Character mistake: In the scene where Sam is filling out the confidential questionnaire, the word "confidential" is spelled "confidentail".
Character mistake: When Ray and Winston are driving across the Brooklyn Bridge around midnight in the Ectomobile, Ray quotes a verse of scripture claiming to be "Revelation 7:12". What he quotes is actually Revelation 6:12. (01:03:38)
Character mistake: When Kyle steals the police officer's gun and asks him what the date is, the officer replies "12th, May, Thursday". The film is set in 1984. May 12th, 1984 was a Saturday.
Character mistake: When Hobbs was at bat for the game winning HR, the base runners were focused solely on Hobbs instead of the pitcher, who could have thrown out either. This was the Majors, not Little League.
Character mistake: Andy speaks of Billy changing in the two months after he was hired when he was hired in the spring months ago.
Character mistake: The map has the word Corazon missing the accent: "Corazón". This is so basic grammar that maybe it was done on purpose.
Character mistake: When Trish's car stops running, Tommy states that its the solenoid that is the issue. A starter solenoid is responsible for sending voltage to the starter when the ignition is engaged. 1st problem: The car would not stumble and stall because of a faulty solenoid. 2nd problem: The starter was already engaging while Trish was hitting the key. So bridging the solenoid was pointless. The only reason to bridge a solenoid is to create a connection from 12 volt to the starter when the internal system is compromised due to wear. But that wasn't the case because when she was trying to start it, the starter was turning the engine. Plus the solenoid has nothing to due with the way an engine will perform (running, misfiring, not running).
Character mistake: When on the phone to the police officer Sgt Halloran, noodles calls him Aiello. Danny Aiello is the real name of the actor.
Suggested correction: In the scene you're referring to, the person Noodles calls, and the character Danny Aiello plays, was the police chief, not Sgt Halloran. In the film, Danny Aiello is credited as Police Chief Aiello. Also, his wife (played by Karen Shallo) is credited as Mrs. Aiello.
Character mistake: In the beginning of the movie everyone shows up on Monday. When Rosenberg is taking attendance he mispronounces the girl's name. She corrects him and he says yesterday and the day before it was something else. That would mean they came to school Sunday and Saturday.
Character mistake: The ref says there's no rules before McClure fights Whiplash but she tries stopping them later.