Just after hearing Pink Floyd's "Shine On You Crazy Diamond (Part One)" and
the Rolling Stones' "Sympathy for the Devil", we see several music albums, and among them is Pink Floyd's "Animals". The scene is supposed to be occurring in 1975, and "Animals" was released in 1977.
In 1973, Raymond's girlfriend Doris wears a t-shirt with the cover of Iggy Pop's "I'm Sick of You" EP. The EP was not released until 1977.
In a scene set in the late 1970s, a VIA Rail Canada train with "Renaissance" cars is visible in the background. These cars were first put into service by VIA Rail more than 20 years later.
At the beginning of the movie, and also during a flashback after his motorcycle accident, Zach as a baby is shown being resuscitated using a clear plastic face mask and bag. Those were not available in 1960. Face masks at that time were made out of black rubber.
It's 1975 and Zach's cousin is sporting the popular Farrah Fawcett hairdo that EVERYONE tried to wear back then. Problem is, Charlie's Angels didn't debut until a year later. Same thing with the Saturday Night Fever-influenced disco three-piece suit. That was made famous everywhere by the original film, but in this film the influence is seen before Saturday Night Fever even came out, which was in 1977.