Hence, Scotty's phaser is seen cutting into the bulkhead with an invisible beam. Unfortunately in later reissues of the episode on video they have since put a visible beam back into the scene.
Sure about that? It's not there on my bluray version of the episode unless you play the episode with the enhanced FX.
Here's a chance to show appreciation for all those bits of added detail that added to the texture and overall fabric of TOS.
The added detail of HD has greatly added to my appreciation of what the team behind the show was able to do back in the 60s on a TV budget.
The one specific thing that pops into my mind is the pulsating vein on the Talosian's head. When I was a kid I thought that was awesome and slightly disturbing.