In the shot of Shawn and Gus driving to great green hope, the Blueberry they're driving isn't their Toyota Echo, but a Toyota Yaris.
Lassiter shows Shawn the NTSB report indicating the plane came in to low when landing. This is maybe only a day or two after the crash. NTSB reports on plane crashes typically take many months to be released, if not years.
Shawn mentions how upset Henry was when "Walker, Texas Ranger" was cancelled. "WTR" wasn't actually cancelled - Chuck Norris chose to end the series.
At the end when Shawn's dad is watching a baseball game, the announcer says ground ball to second. But on the screen it shows a ground ball to the shortstop.