There are many wrong dates in the DVD extra disc as well as in the films themselves. For example, the flashback at the end of GFII shows the Don's birthday as December 7, but his tombstone in GF gives his birthdate as April 28. At the Senate hearings in GFII, the Senator asks Michael if he was responsible for the murders of the heads of the Five Families "in 1950 [sic]" when we know it occurred in 1955. The only thing that can be said in defense of thes errors is that we're dealing with a Trilogy that spanned 20 years between the first and third films, and involved thousands of pages of script--anomalies were bound to creep in. Besides: look at all the fun people like us have with finding these errors!