Continuity mistake: John wakes up in a hospital bed, with a doctor talking to him in a rather aloof tone. The stethoscope around Doctor Mirione's neck changes position every time the angles switch; the bell is either at his collar or all the way down to his coat's pocket. (00:25:00)
Factual error: John Callahan is still a struggling cartoonist who has not even gotten his first gig when he shows to a woman at the library two sketches, the second being a joke about Starbucks opening a new coffee store in someone's rear end. Callahan shows the first issue of the Portland student gazette to a policeman a few scenes later and it is dated 1978, Back then Starbucks hadn't even expanded outside of Seattle yet, it will begin only a decade later. (01:07:45)
Factual error: Annu's SAS stewardess uniform (the company is explicitly mentioned) is accurate in colors and design for the time period (it's the pre-1983 type), but the hat lacks the crest of the company, having just a generic golden laurel. (01:08:20)
Revealing mistake: Callahan proudly shows to a policeman an issue of the Portland State University "Vanguard", the magazine that is publishing his comic. Looking at the prop, it is instantly suspicious because Callahan's name is all over it like he's a celebrity, and in fact, the article on it is nothing but a copy and paste of Timothy Egan's "Defiantly incorrect" article from The New Yorker celebrating John Callahan's talents in 1992. (01:12:55)
Factual error: Jonah Hill references "Chucky" from the movie Childs Play. This movie's period is set somewhere in the late 1970's. The movie Childs Play didn't come out until 1988.
