Robin's date is played by Pam Dawber, who played "Mindy" of Mork & Mindy (1978), the show that made the two famous. The last line she says to him is: "I've never met anyone as screwy as you. You're like - you're like an alien!"
It is said repeatedly in this episode that the character of Neil is from Dearborn, Michigan. Dearborn is a suburb of Detroit, very close to where both Robin Williams and Pam Dawber grew up.
In 2 pivotal scenes, David Copperfield magically vanishes and reappears with Robin Williams. Both magical moments were done with no CG or camera tricks and created by David's long time collaborators, Chris Kenner and Homer Liwag.