Sam's gift is signed from him to Rebecca yet he never signs it and it's even the wrong gift.
Woody dials 11 digits on the phone to call his mom in Indiana. To make a long distance call on a landline, a person would dial 1 plus the 3 digit area code followed by the 7 digit phone number, making a total of 11 digits.
During the news bulletin about Cliff throwing boxes of Chinese Food at an airline jet, the Anchor gives the name Boston Airport. The city's airport is actually named Logan Airport, and is never identified under the name Boston Airport. Earlier references would have been Logan (Air) Field.