Edward Snowden asks Pinky and Brain to rescue a plant from the NSA, mentioning that it's the only plant he has managed to grow from seed. Later, it is revealed that the plant is a rare species of fern. However, ferns don't produce seeds, since they reproduce via spores.
The Friends (1994) fountain isn't on the Warner Bros lot. It's on the Warner (formerly Columbia) Ranch.
The tour guide says "if you look to the right of the bus, you'll see the fountain where they filmed the opening to Friends". However, the fountain is on the left side of the bus.