When it comes to the difference in the pilot in what was most recently covered from Scenes 138 through 142 in the script, Vicki doesn't actually become "very uncomfortable," she becomes somewhat annoyed - and after she closes David's textbook in an unscripted move, what she actually does is order "Open the desk, David" - however, David's quiet "Okay..." response is dropped in favor of him simply shrugging and opening the desk, but we don't actually see inside the desk - instead David pulls out a Rasola cigar box (not a "screened strawberry carton") and holds it in his hands above the desk - and after Vicki asks an unscripted "What's in there?", David replies with an unscripted "Are you sure you want to see?", to which Vicki answers with an unscripted "Open it, David!" - and it is after that that David open the box and we see "A BIG, BLACK HAIRY TARANTULA! scrabbling around inside", whereupon Vicki actually reacts with "Oh God! ... Close it!", and David does - and after David reminds her that he told her, Vicki actually replies with "Where did you get that, David?! That's very dangerous!" - but David matter of factly replies as scripted "Naah ... Not if you don't get it mad", but he doesn't grin, and he continues with the scripted "I got a whole bunch of 'em" before he inserts an unscripted "This one's named Harry" and then tweaking what's scripted, he finishes with "I catch 'em down in the wood pile in back of the barn" - and as for the final difference, Vicki actually replies with "David ... The lesson is over. Take that thing out of here right now and get rid of it!"