yeah, the transcript page is more or less a static page. you can do stuff like starring or flagging from there for convenience, but one obviously shouldn't expect the same kind of realtime interaction as on the live page
Would it be possible to handle starred onebox posts specially in the right-panel list of starred posts? It's be nice if they stayed links but the text was something useful instead of just the URL (the title for SE posts, the text for tweets, etc.)