Nobody does hidden details better than Pixar.
The train in the opening scene is number 95 — perhaps a reference to the year the first Toy Story movie came out — 1995.
Pixar / disneyscreencaps.com
And the initials on the caboose read W.R.R. — which could stand for Woody Rail Road.
Pixar / disneyscreencaps.com
That giant watch on the wall appears to depict Mickey Mouse — a hidden Mickey!
Pixar / disneyscreencaps.com
