Nurse Susan gives the "real" date as Saturday March 3rd - This was actually the date this episode was first broadcast. (The date mentioned in the episode matches with the original date of broadcast once again in 'To Snare A Wolf' at the end of the season)
Goof: Michael Halsey's character in this episode is called Peter McGregor Moore, but at one point, Marella wrongly refers to him as Patrick McGregor Moore. (Interestingly, the DVD subtitles correct this mistake)
Normally when Airwolf's doors open or close, they give a loud hiss due to the pressurized cabin. Yet somehow, Dominic manages to open them silently and get the jump on Hawke's captors at the climax of this story.
The call letters for the faux TV station setup at the hospital, KSLH, in reality belong to an FM radio station based out of St. Louis, MO.
Goof: cinematography When Dominic deploys the drag chute to slow Airwolf's drop from the back of the plane, the shots cut back and forth between the chute opening and Airwolf in flight/drop. The scenes with Airwolf in flight obviously do not show a chute and the scenes with the chute were obviously shot separately and added in. This is a bit of a nitpick considering the 80s film technology doesn't allow for the advanced cutting and editing of today's films, which probably would have produced a more synchronized shot.
The footage of the chopper that Hawke is in crashing into the side of the mountain, is a stock sequence (one of the other places it can be seen used is in the second season 'A-Team' episode 'The Battle Of Bel-Air' (1984).
Continuity error: when Nurse Susan is in the elevator with St. John('s impostor), as she exits the elevator, we see a shot of her in which she says "Bye" to him as the elevator doors start to close; but in the following shot of St. John replying "Bye, have a nice day", the doors don't appear to be moving.
The shot as one of the heat-seeker missiles lands in the ocean is quite obviously stock footage – and the missle seems to hit by a boat or some sort of rig, something which quite clearly wasn't there in other shots.
Susan: A helicopter? All this for a lousy helicopter?
In the 1980s, re-released in the 1990s, this episode was released in the UK and some countries on video by CIC, who merged it together with 'And They Are Us' to form a "feature-length" story, called 'Airwolf II: A Deadly Mission!', though the on-screen title was 'Airwolf II: The Search' ('Airwolf I' being the video release version of the Pilot). The two episodes were joined, rather awkwardly, in the middle, with this one playing second (however, unlike the video version of the Pilot, other than being joined together, these stories played in their original version).More recently, this episode has been released in it's original state, on Universal Playback's 'Airwolf: Volume 3'.
This episode has the second version of the 'File A56-7W' opening dialogue, and is the first to use the 'computer file' graphics that accompany it. The visuals would remain for the rest of the sequences use until the end of the season; this particular version of the dialogue was used once more, in the next broadcast episode, 'Fight Like A Dove'.
This episode can often be found listed as 'Echoes From The Past', with echos spelt the alternative (and generally preferred) way; but the on-screen episode title is 'Echos From The Past'.
Episode Title: "Echos from the Past"
The title of the episode is a reference to a 1925 black-and-white movie titled "Echos From The Alps."