Update: It's been a few weeks and I re-listened to "Hey Bulldog" and yeah it still reminds me of Led Zeppelin's "Misty Mountain Hop."
Update 2: It's been like two months and I'm trying to discern if "Hey Bulldog" still reminds me of "Misty Mountain Hop" this fine Tuesday evening after a long day.
"Yellow Submarine" is the soundtrack album for their 1968 film of the same name, with Side A including various compositions from The Beatles and Side B comprising of orchestral songs from producer George Martin. Apparently the recording of this album was a contractual obligation for The Beatles rather than a passion project, and it kind of shows unfortunately. That being said, it has some notable moments. George Harrison's "It's All Too Much" is a fun song, with groovy rhythms created from guitar feedback. "Hey Bulldog" is also interesting, with its "Misty Mountain Hop" vibes.
If you’d like to see the rest of my The Beatles ranking, here is my list: