Hmmm....

Spoilers abound:)

Overall a pretty good effort on what was obviously a shoestring budget. One is reminded of Absentia, another very low budget film that was well thought out & executed.

By & large.

Granted the female protagonist is a social worker candidate & not a journalist or detective, yet it seems odd that neither she nor those assisting her try to verify Alistair's account by examining his uniform closely—it would be hard for some random homeless nutter to obtain an authentic, all wool, no zipper Great War uniform—or even try to contact British war archives for the service record of an Alistair Morley. Even as she claims to believe him, she's utterly incurious about his time or the war in which he fought.

Alistair himself never has the slightest hesitation about returning, though he must have learned that the war & Britain's victory will have proved not only futile, but destructive in light of how the first war ushered in all of the circumstances for the second, essentially destroying the British Empire in the process.

Of course, his focus is on wife, Millie, so perhaps that's understandable.

The most difficult part to fathom, of course, is the French scientist & her portable wormhole entry kit. Even though their first effort to return Alistair is a goof, the facility with they set it up & the second, successful attempt, suggests it's been done before—that would be big news: Wormholes! Time Travel!

Still, for all of its logical flaws, Alistair's return was far better thought out than in that 70s film with the USS Nimitz going back in time to just before Pearl Harbor.

Best line in the movie is early one when Alistair admits he went to the British Consulate in LA!
Wow!
Something an actual person in that situation might actually do!

The film is dedicated, apparently, to the director/star's ancestors portrayed in Great War military garb (& one who apparently didn't make it home). All in all Alistair1918 is a fine tribute to them & their sacrifice.