As with everything Beatles, you can almost always find some sort of supernatural weird thing hanging around if you look at the LPs.
From the Magical Mystery Tour booklet.
The Abbey Road back cover
…and another face found in the trees of Abbey Road.
Of course the Beatles were also guest stars in other albums of the era, making an appearance in the Dylan LP John Wesley Harding and the Stones Their Satanic Majesties Request (Obviously the Stones did theirs on purpose).