Mannix passes Bruck's Oldsmobile store (written on a sign) three times within in a few seconds in his car.
In the opening sequence (right before the credits start to roll), a rope attached to the lab technician, which pulls him backward after the explosion, is clearly visible.
Lew gets on an RTD bus that's turning from Los Feliz Blvd. onto Hillhurst Avenue. The bus travels straight for several blocks while Lew has an altercation with a lady whom his steroids-induced dementia makes him think is Fred. When the lady screams, Lew wakes up and exits the bus, which is impossibly back on Los Feliz Blvd. a half block east of where it supposedly turned.
Julian Burton's character is credited as "Detweiler" despite the fact his surname is spelled "Detwiler" on his office door.