After the guard is knocked out during the rescue in the print shop, Ham waves everyone out back and we see Donovan being led up the stairs to replace John. When we next see Donovan, he is on the street still talking to Charles, and then gets led up the stairs again.
While meeting with Charles, Lydia reached into a bowl of live worms. The worms on the top are gummy worms.
When Diana shoots at Donovan with her laser gun, the beams strike a wall and a cabinet. Neither is damaged or even marked.
At the end of the episode where Charles fights with Donovan, Charles takes off his dark glasses.
The Visitors wear the glasses as its too bright for them and potentially blinding. As Charles took his off, he suffered no ill effects from the sunlight.