Haley tells Brooke that Deb is "literally out to lunch". Haley is portrayed as highly intelligent and should have to known to say instead that Deb is figuratively out to lunch or Deb isn't literally out to lunch.
In the beginning, Nathan is laying on the bridge and his shirt has the number 20 on it, but backwards. Later, the number 20 is no longer backwards.
When Nathan wakes up on the bridge his shirt has the number 20 backwards, but in the episode previous it was the right way when he was on the bridge.