When Dan calls Roger to try to get his pin number for his bank account, he asks him his date of birth. Roger says it is 3rd May 1977, but when we later see what Dan has written down it reads 3rd May 1973.
When Dan is sitting in the shower, the tattoo (which was real and was blacked out for some reason - it is actually a cluster of planets) on his shoulder smudges and transfers to the shower tile. The next scene it is intact.
The copyright statement "Ownership of this motion picture is protected by copyright and other applicable laws, and any unauthorized duplication, distribution or exhibition of this motion picture could result in criminal prosecution as well as civil liability" appears to times back-to-back at the end of the end credits.