The aircraft that Kevin and Jenna try to fly to Aspen in is shown connected to the airports jet-way. It is a Boeing 737 with blue painted engines. 737's have a 3x3 seating configuration but the interior shots show a smaller aircraft's interior with a 2x2 seating configuration. When the aircraft taxis and takes off, its engines are now red.
When Jenna and Kevin are discussing the picture of the Winters, Jenna is wearing a ring on her left ring finger, generally signifying engagement or marriage. Not wearing any ring throughout the rest of the movie. Probably a personal item of the actress while filming that failed to be noticed and removed in editing or re-shot.