I noticed that too! I thought it was pretty cool to see space mountain in a disney animated movie
Is it just me, or is a very close resemblance to Space Mountain featured in the trailer for next spring's The Robinsons? It's also located in 'Todayland'. Haha!
Here is the trailer: Meet the Robinsons
The SM twin is located about midway through and it's quick, so be on the lookout!!