In the wedding, Elliot hands over a drink to Amanda. She accidentally blows off the yellow mini-umbrella of her drink. Elliot licks the stick of his pink mini-umbrella and puts it in Amanda's drink. The next scene shows Amanda still has the yellow mini-umbrella on her drink, and Elliot still has his pink mini-umbrella on his drink. Although, in a film about how perception effects reality...maybe the umbrella was blue!
Depiction of quantum mechanics in the movie bears no resemblance to the real theory of that name. In particular, the common misconception that the "observer effect" is dependent upon a sapient, human observer is incorrect. If any object interacts with any other, and either requires information regarding the current state and properties of the other, then that constitutes an observation.
An urban myth about native Caribbean people not being able to see Columbus' ships is repeated. Not only is this story unproven, the earliest recorded version of this myth was originally told about how Australian Aborigines and Captain Cook's ship, not Columbus.
The Portland Trimet MAX Rail that goes to Hillsboro is the Blue Line, not the Red Line as shown in the second half of the film, when Amanda get on, even in 2005.
On the steps of the church, Amanda was offended enough by the young men's crass comments that she flashed her camera in their faces. However, she was not in position to read their lips.