Philip Seymour Horseman

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The name "Philip Seymour Horseman" has appeared in several Space Tree Episodes, but has only been seen in character as of episode #50 Phil:

In Panic Broom, the Commander had a list of "People I Know". It included Philip Seymour Horseman
In Serious Tingling, Space Tree said before dying:
"I mean not even Philip Seymour Horseman showed up."
In The Giving Tree, Tarbob wanted to interview Philip Seymour Horseman instead of Space Tree
In The S Word, Philip Horseman is one of the names Mee lists when trying to come up with Allon's real name.
He appears in The Italian Job in a film PinkFrosting88 and Reginald watched. In that film, he played a character named "Longface Man".
In The Tree Whisperer, the Commander tries to get into The Captain's Club with a trial membership card to the unofficial Philip Horseman Fanclub.
In The Sanctity, the Commander puts up a movie poster of "L for Longface man", a movie starring Philip Seymour Horseman.
In The Commander, Philip Seymour Horseman signed the mug for the "World's greatest Commander award", apparently he is the founder of Chanelle J News, the network, Tahoma Fresh works for.
In The End, when the ship exploded, one of the parts for the ship read "HORSEMAN".
In Phil, Philip Seymour Horseman narrates and is seen in character for the first time.

Philip Seymour Horseman obviously refers to Philip Seymour Hoffman, the Academy Award-winning American movie actor.