Wow! They sure got that part about Commodore marketing correct.
I think that they were a bit off the mark on some of the dates mentioned. I'm sure that the Amiga existed prior to the 16th century. Recently I saw a documentary about some farmer who in 1898 found one buried in a field in Minnesota. It was later dated back to the 14th century and is believed to have been left there by Vikings!
I'm also fairly sure that the Mayan calendar was created using CAL Calendar Maker by Gramma Software.
Heimdall 2 was a documentary