yeah the easter eggs are pretty simple

main easter egg (activating the weapon portal)
shoot the cold war pack-a-punch machine with a ray gun or a mk3. that's it lol

free jug easter egg
shoot all of the jug bottles around the map. there's 14 in total and there's at least one in every room

free phd easter egg
either throw a grenade in all the barricades around the map or shoot them with the ray gun.