Plane Death - S1-E14
Deliberate mistake: When the bartender shoots the shotgun at Landon, the windows blow out the wrong way. This was likely done for the actors' safety. Also note how Landon flinches a bit off beat from the explosion.
Plane Death - S1-E14
Deliberate mistake: When the bad guy goes to smash a table onto Michael Landon notice the plate of glass in front of him, visible. The glass is there so Landon doesn't get hurt and to make the table break into pieces in front of him.