Factual error: Zippo lighters are sold dry, no fluid when new.
Factual error: The film is set on Halloween (31st October) 1993. At the start of the film, Max is shown at school on Halloween. However, Halloween 1993 was actually a Sunday.
Factual error: The Sanderson House had been turned into a museum complete with a gift counter. The museum had been closed for years (note the dust and spider webs). The fluid in the lighter Max gets would have evaporated after a few months as Zippos are not airtight like a plastic disposable lighter would be.