As inaccurate and dated as it is, I'd still like having a small hopping dinosaur, just the one. It's also a relatively straight forward way to differentiate a dinosaur, albeit probably not the easiest.
I'd say that going for Kangaroo/Wallaby inspired movements might be most appropriate given the size, weight and bipedal nature of the animals.
The obvious candidate is Othnielia, being an arboreal hopper in the novels and also now a fairly dubious Genus itself.
My favorite candidate is Qantassaurus, being only known from a set of jaws and being named after a company that uses a Kangaroo as it's logo, though there are a plethora of other small bipedal ornithischians you could probably get away with for this purpose.
I believe hopping was originally a theory in the 1920s for Theropods like Megalosaurus, though probably looks a bit out of place for the big ones.
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