What model is that old convertible?

I would have to disagree with Bruno.

The Goat was based on the mid-sized Tempest chassis which was superceeded by the Grand Am.
In fact, before it's (first) demise, the GTO had become simply a sporty trim option available in the Grand Am series.

I do agree with the vintage, but I would expand that a little, say, late 60's/early 70's (leaning more to early 70's).

There's also the fact that you can see a rather long name printed on the passenger side rear fender in one of the shots.
Plus, the overhang and front end treatment screams full-size Poncho of that era, not mid-size.

It's either a Bonneville or a Catalina convertable.
Which one would depend on trim options (the Bonnie being the "deluxe" version).

Sorry Bruno, I can't recall the song.
I'll rent the movie again and if I can find out, I'll post a reply.

cmiddelmann posted this question last December. I wonder if he's ever checked back on it. I see no replies.

the song is Tom Wilson's "Dig it"

And what about Woody Harrelson's character, who's got some weird-looking car ?

No-one cares, but the motorbike is a Honda CB 250 or 400 (Both are almost identical) Twin engine from the seventies ! :)

Totally wrong, Blake.
Actually, rubenyc and Phroggy got it right.
According to the IMCDB, It's a '67 Bonneville and a '78 CB250T.


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Well, I've just died for it.