After Susan breaks out of jail to find Baby, Alexander Peabody (George Irving) shows up to identify Aunt Elizabeth. Satisfied that Elizabeth is who she says she is, Constable Slocum (Walter Catlett) releases her, David, Major Applegate (Charles Ruggles), and the gardener (Barry Fitzgerald). Just as everyone is about to leave the station, the two men from the circus show up to report their missing leopard. As the circus men are trying to explain how the wild leopard escaped, Baby and George come waltzing through the door. Everyone panics when they see Baby, until David pets it and the man from the circus realizes that it's not their leopard. Meanwhile, Susan has roped the wild leopard and is attempting to pull it into the police station. Realizing that Susan is dragging in the wild leopard, everyone again panics and runs pell-mell into the jail cells to hide. David manages to corner the wild leopard in one of cells, locks the door, and promptly faints.
Later, back at the museum, Alice breaks off her engagement to David now that she's seen his "true colors". Alice leaves, and Susan walks in, bearing the "intercostal clavicle" and the million dollars from Aunt Elizabeth. David quickly climbs to the top of the scaffolding on the left side of his precious brontosaurus skeleton and tells Susan to place the bone on a table and go away. Undaunted, Susan climbs up a freestanding ladder on the right side of the skeleton until she's at the top of the ladder and directly opposite David. David pleads with her to get down off the ladder but admits that he's never had so much fun as when he was with her. As they confess their love for each other, the ladder begins to sway. In order to keep from falling to the floor, Susan grabs onto the brontosaurus. The brontosaurus begins to break apart, so David pulls Susan onto the scaffolding with him. In the final scene, the brontosaurus bones fall to the floor, leaving Susan and David atop the scaffolding, in each others' arms.