In the part where Blinkin' gives Robin the key, Robin slips it over his head and its case accidentally opens, displaying a small gold key. The actor that plays Robin must have noticed, because he quickly slaps it shut and tucks it into his shirt.
I don't think this is slip-up because Blinkin hands the key over to Robin saying that it is the "key" to the greatest treasure in all the land.
If this happened and was truly an accident, don't you think that Mel Brooks could've re-shot the scene. They tell you that it is a key from the beginning but suspense is kept by the fact that you don't know what the treasure is.
Mel Brooks doesn't care if you see the key. Plus; Robin doesn't quickly snap the case shut, he shuts it calmly as if to keep the key inside.
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