At 18:09, the library scene cuts to a different camera. Rory has her mouth closed but in the next shot it's open.
Around 34:45, before Meg mentions Ryder's birthday party, a camera shows her smiling vapidly, but in her next shot she's shaking to clear her head in reaction to Todd and Rory and to turn her thoughts to Ryder's party.
Although not impossible, the opening conversation between the Todd and Rory (not a give-away because it is literally the opening of the movie) develops from Rory saying Todd might generally be mistaken for an employee based on his putting things (for instance organizing books) in order.
Todd replied that no, someone mistook him for a Staples employee, asking where the paperweights are, and he wasn't doing anything, just standing there.
Perhaps it is a dig at Staples employees who just stand there, or a play on the fact that he was not doing anything and was asked about paperweights. Yes, there are decorative desk things they sell as 'paperweights' at Staples, but nobody ever went to Staples to buy a paperweight. Inventing some scenario that didn't happen or joking is out of character.
Todd replied that no, someone mistook him for a Staples employee, asking where the paperweights are, and he wasn't doing anything, just standing there.
Perhaps it is a dig at Staples employees who just stand there, or a play on the fact that he was not doing anything and was asked about paperweights. Yes, there are decorative desk things they sell as 'paperweights' at Staples, but nobody ever went to Staples to buy a paperweight. Inventing some scenario that didn't happen or joking is out of character.