If you rewatch, look for these specific details that prove the "Stage" nature of his life:
In the original film, Truman is tracked by 5,000 hidden cameras. In a modern context, the "Mega Updated" perspective shifts from a single man being watched to an entire society that films itself. the truman show mega updated
For the uninitiated (or those due for a rewatch), The Truman Show follows Truman Burbank (Jim Carrey), an insurance salesman living in the idyllic town of Seahaven. Unbeknownst to him, Seahaven is a massive soundstage under a giant dome, his "friends" and "family" are SAG-contracted actors, and his entire life is directed by a visionary demiurge named Christof (Ed Harris). If you rewatch, look for these specific details