There are two possible outcomes here, both of which require an assumption of something not expressly stated in the show. Both can be correct based on your belief of whether or not Newman knew the explicit date of his restaurant reservation. Scenario 1: Newman booked the reservation for 12/31/99 thinking it was the millennium new year. Jerry informs him that the actual millennium new year would be 12/31/00, and he should have said Newman booked his party one year too EARLY. thus the line is an error. Scenario 2: Newman booked the restaurant for "the millennium new year" assuming that the date was 12/31/99. Jerry tells him that the actual millennium new year is 12/31/00, and thus his party is booked for one year later than his invitations indicate. Thus, the last line of the show would be correct as is, and Newman's party would be one year late. Given the evidence, I choose scenario 1 for the following reasons: 1. It is very unlikely that Newman would have not known the exact date of his restaurant reservation. 2. The second explanation assumes that the restaurant would know that the actual millennium new year was actually 12/31/00. Given the confusion around the date and the fact that Newman made the reservation in the 1970's, this is highly unlikely. 3. Scenario 1 just makes more sense to me. It makes Newman look like an idiot for making the common mistake of throwing a millennium party one year too early. Given his excitement for starting off a new millennium on the right foot, that seems much more likely to me. Of course, my wife disagrees completely and goes with scenario 2. :-)
