Goof: When Carol takes the paramedic's call, she states that Mr. Canterna is 29, but when the paramedics bring him in, they say that he's 31.
Goof: When Anna walks out of the trauma room because she can't perform the abortion, she takes her glasses off, but the next shot shows her taking her glasses off again.
Goof: When Reese dumps his bowl of oatmeal on Benton's head, you can see that it is a white adult hand knocking it over.
Goof: When Peter stumbles across his sister, you can see the shadow of a camera operator on the ground.
In this episode we find out that Mark's father was an A-6 Intruder pilot in the Navy.
Goof: Although Dr. Greene performs a few medical procedures in San Diego, he is not licensed to do any outside of Illinois.
Goof: When Mark is driving across the Coronado Bridge, the traffic report on the car radio mentions the ship USS Long Beach entering port. The USS Long Beach was decommissioned in 1995, and her last voyage was to the Puget Sound Naval Shipyard in Bremerton, Washington.
Goof: Doug tells Carol he will meet her on the corner of Clark and Dearborn, which is impossible; they are parallel streets.
Goof: When Carter is giving his class on "Emergency Medicine" to the medical students, he is asked if he ever killed a patient. He responds that he accidentally lacerated a patient's liver when he was a surgical intern. This, however, happened in the Season 2 episode "Do One, Teach One, Kill One", when Carter was a 4th year medical student.
Somewhere in Doug's life he had to have had some Catholic upbringing. After he knelt in front of Pedro Lopez's marker on the side of the road (Pedro Lopez was the man Doug's father killed in the accident), he rose up and made the sign of the cross.
This is the first episode of ER to take place entirely outside the hospital.
Goof: In the breakfast in bed scene, Doug tucks a napkin into the collar of Carol's nightshirt. Between shots, however, the napkin corner switches from being tucked in to being spread out.
Additional actors were ready to improvise if something went wrong (forgotten dialogue or technical problems). Fortunately, they was never used.
Goof: Towards the end of the East Coast version of this episode, you can see Kerry Weaver walking without her crutch.
When the title is shown at the beginning of the episode, it reads "ambush," without the first letter being capitalized.