The calendar on the wall of the police detective's office is an actual April 1954 calendar that shows the first day of the month falling on a Thursday and the last day of the month falling on a Friday. This wall calendar can be seen out of focus during a time when Webb's monologue voice over claims was "Saturday, April 23" and again in focus on "Monday, April 25." However, the authentic calendar on the wall is a day off from Webb's claims with Saturday being April 24 and Monday falling on April 26.
The murder scene is an open lot bounded by Loma Vista, 3rd, Wentworth and Rachel. These are actual streets in the LA area but do not intersect or form a block. Obviously the geography is intentionally inaccurate, which is also the case with that referred to hundreds of films and television programs. In such instances, if an actual address is used the occupant would have grounds of legal action if the location were to attract unwanted visitors.
When Friday and Smith enter the elevator, Friday pushes the button and Smith bobs for an instant to indicate elevator movement. Friday barely bobs. When they reach their floor Friday finishes his line by bobbing to indicate the elevator stopping but Smith does not. The unintended humorous effect makes it seem that Smith curtsies at the start of the ride and Friday curtsies at the end.