The walrus was Paul.

I am the Eggman, they are the Eggmen, I am the Walrus

What's [the Beatles'] I Am the Walrus all about?

You don't ride the Walrus the Walrus rides you.

Not true, ... They were best friends. They were together all the time, all four of them. John and Paul wrote together or apart, then they brought their writing to each other.

The time has come," the walrus said, "to talk of many things: Of shoes and ships - and sealing wax - of cabbages and kings