When Rory and Lane are talking in Lane's bedroom, the antacid bottle changes positions multiple times.
When Lane and Rory are discussing Lane being pregnant, they begin referring to the children of celebrities with strange names. They mention Tom and Katie's child Pillow, but their child's name is Suri.
It has only been a week or so since Liz told Luke she is pregnant, yet she is visible more pregnant than the last time she was seen.