First, there's this great sauropod staircase, leading from the entry level to the mezzanine and second floor. You can barely make out her head in the first shot...
...so here's a close-up.
On the second floor is a small room of natural history type stuff, presumably from other institutions' defunct displays. I was thrilled to find a glass case containing a bunch of fossil casts, including Tapejara, Velociraptor and Masiakasaurus skulls, and some others I didn't get good pictures of. Not that these are hot stuff; I've never been good at snapping photos through glass.
Opposite the display case is a diorama containing various reconstructions, including Bambiraptor, Compsognathus, Sordes, and Anurognathus. They were created by Missouri's Fossilsmith studios; unfortunately, it doesn't look like they've done a lot in the last few years (or maybe they're so busy they haven't had time to update their site). Their work here is excellent. Seeing that extravagantly feathered bambi when I walked into the room was such a great surprise.
The room also has a case full of other assorted fossils and casts, including various pterosaurs and a reproduction of Archaeopteryx. Really, its a lot of paleo crammed into a pretty small room. There's also a Pteranodon hanging from the ceiling on the ground level, somewhat out of place as the rest of the area has an undersea theme. But I'm not complaining.
Seriously, this is a must-see if you're ever in St. Louis.