Spies Like Us takes place in the U.S.S.R. Anyway I know it's not Spies Like Us. I just thought it would get a chuckle.

I would have guessed Ronja Røvardotter (Ronja the Robber's Daughter) if it hadnæt been for that mushroom. Because of the funny little people in fur.

The second still alludes to a certain pre-Christian seasonal tradition which should narrow down the region the film takes place in. Not that relevant to the plot but the three pictured are harassing someone for a specific reason under the guise of said tradition.

The following should help with the approximate time period as well as hint at the corresponding socio-ideological climate.

Looks like I've picked something too obscure and/or too recent again.
One more (and last) still:

I would assume, the second picture is a hint on the alps, and the movie could take place pretty much in any riparian state in that region (Germany, Austria, Italy, etc.)
The figures depicted are called "Klausen", "Kramperl", "Tuifl", etc.

The time period...could be around 1800.
The third picture (hooded figure taking away a dead (?) body) could point to at least two things: war or disease.

The alps, around 1800, war...all that combined could point to the Tyrolean popular uprising of 1809.

The only movie that I could find that fits these criteria would be "Bergblut" ("The Holy Land of Tyrol"), though I have no idea, if they took 'shrooms in that movie, or if the "Kramperl" have a role in it.
Anyway - that's my best guess. ;)

...or "Perchten" (from Perchta, a prominent pagan deity of the Alpine region which sometimes is also regarded as the 'original witch').

Which, together with the 'shroom ingestion, the plague victims being carted away (placing it in the late Middle Ages still ripe with suspicion, prejudice and scapegoating) and the satanic symbolism (that's a snake slithering across Albrun [the protagonist]'s neck in the last still) I thought could have been enough for cross-referencing and thus figuring it out anyway and without actually having seen or ever having heard of the film in the first place.

Well, it's Hagazussa, the slower-burning, more atmospheric and less cliché-ridden alternative to The VVitch.

Whoever wants to go next - you're it.

Well then, here's another:

It looks like Peter Cook sometime in the 1970s.

"Dog Day Afternoon? Maybe "Cruising"?

It's not Peter Cook, but you got the decade right.
Nope and nope.

Spectre also got the general geographic area right with that name, no?

So, maybe "Quadrophenia"? At least I think the one on the right might be Phil Daniels.

I love Godzilla II

Neither Quadrophenia, nor Phil Daniels. But you are right, it's a British film.

This ought to make it a lot easier.

(At least for those who know who the actors are.)

Bonus pic.