Other mistake: In the opening scene, something catches the husband's eye through a window. He asks his wife to take a look and she gets scared. There is a dead body. When Lenny and Curtis arrive, and are lead back to the body, you can see the view from the street is obstructed. There is a display case, a pedestal, a vase and finally a wall. The head of the body wouldn't have been visible from the street and there was no other disturbance to catch someones attention: The husband and wife couldn't have seen anything.
Law & Order (1990)
1 other mistake in season 7
Factual error: Ryan, the laboratory technician, eats his lunch of burger and fries while discussing a murder case with Assistant D.A. Claire Kincaid. Trouble is, they are in his laboratory. No lab technician ever, ever eats or drinks in a laboratory - it is the most basic lab protocol imaginable. He could contaminate his samples in any one of a hundred ways, he inevitably contaminates his gloves or fingers with residue from his meal and he risks poisoning himself with accidental transfer. This is not a character error - lab security is hammered into science students starting with the first day of first year and number one on the list is never, ever eat or drink in your lab.
Det. Lennie Briscoe: You know, if I didn't already know you don't have kids, I'd know you don't have kids.
More trivia for Law & Order
Question: I don't remember if it was this show or another L&O, but there was an episode where a reporter was overseas at a military encampment, reporting on a war. While there, he explains the military's plans by drawing them in the sand. Shortly later, the encampment is attacked. How could the enemy figure out where the encampment was? The reporter never said where the location was at, only what the soldiers were planning.