There’s a Macintosh in Prince’s 1990 Graffiti Bridge movie.
It can be seen twice: at the beginning, during the first scene, and again at the end, during the end titles.
In both instances it is being used by Prince to write and/or edit music. Prince, or rather “The Kid”, the character he plays, keeps the computer in his living quarters located just under the stage of the “Glam Slam”, the club of he is the (fictional) owner in Graffiti Bridge.
Although the Mac is always shown in mid-darkness and the camera closes up only on the screen (more on that later) but it’s clearly a compact Macintosh and considering when Graffiti Bridge was released, in November 1990, the list of possible models is pretty much easy to narrow.
We can immediately cross out the Mac Classic because it was introduced in October of 1990, just one before the movie showed up in theaters. Another model we can exclude is the original Mac, released in 1984, which was too old and frankly too underpowered for a serious musical use. The same is probably true for the “Fat Mac”, from 1985 which just had more RAM memory.
This leaves us just very few choices. Three actually: a Plus, a SE or a SE/30.