9. TF Montag "stumbled and fell" because the beetle "fired from an invisible rifle."

False, it was the hound who injected something into his leg....

"Montag caught it with a bloom of fire, a single wondrous blossom that curled in petals of yellow and blue and orange about the metal dog, clad it in a new covering as it slammed into Montag and threw him ten feet back against the bole of a tree, taking the flame-gun with him. He felt it scrabble and seize his leg and stab the needle in for a moment before the fire snapped the Hound up in the air, burst its metal bones at the joints, and blew out its interior in the single flushing of red colour like a skyrocket fastened to the street. Montag lay watching the dead-alive thing fiddle the air and die. Even now it seemed to want to get back at him and finish the injection which was now working through the flesh of his leg."