While Luke and Lorelai are standing in front of the Mail Boxes Etc. arguing about where he should be getting his divorce, the back of Lorelai's hair is messy and showing her weaves. The camera moves back and forth between Luke and Lorelai several times. In the first 3 or 4 times her hair is messy at the back. The last couple of times it is smoothed over.
When Lorelai is talking to Luke in front of the post office, a Jeep and silver Sedan drive by numerous times behind Lorelai.
(Around 30') When Rory and Lorelai finish their dinner they rush leave the house without their coats, you can ear the front door closing, and then they are wearing the coats.
Lorelei and Rory leave the house and find Emily's car in the driveway. When Emily comes out, they hide in the bushes while Emily gets in her car and drives off. But Lorelei's car must also be in the driveway - she always parks right in front of the house - and Emily would notice that. She wouldn't just drive away since she's trying to hide what's happening from Lorelei and Rory...and she'd also either have to back up or navigate around their car (unless she did so when she arrived).