After being brought onstage last week by Tony winner James Corden during “One Man, Two Guvnors,” Donald Trump was unexpectedly part of another Broadway act. When Patrick Page, who plays the Green Goblin in “Spider-Man: Turn Off the Dark” spotted the mogul sitting in the fourth row, he ad-libbed in villainous character: “I have these hallucinations . . . Sometimes I think I see things . . . I even think I see Donald Trump. There’s only one problem: How do I know it’s the real Donald Trump? Maybe I could ask him to show me his birth certificate.” Our spy said Trump “ate it up” with the rest of the audience: “He had a big smile on his face the whole time and gave Patrick a wink during the curtain call.”