Theory. Either Peter or Steven said something recently about The Doctor talking to his now dead companion, Clara. So it’s possible he’s also imagining her there with him, and that’s why we see her in that shot? I HOPE NOT BECAUSE THAT’S REALLY FREAKIN UPSETTING BUT THAT’S ALL I’M THINKING NOW

Hmmm, could be. I don’t see them bringing her back for the finale in the exact outfit she wore when passed as part of a hallucination. I think if they were going to go that route, they would have done that in Heaven Sent since it would make sense. The Doctor trapped for years in wherever he is trapped, there were bound to be moments that he would talk to his deceased companion in a hallucination. I am doubtful that it’s a hallucination in Heaven Sent and I am still on TEAM NOT ECHO. I don’t believe the Clara in a waitress uniform is an echo. We shall see, nonny!