This first one isn't exactly a blooper--more a matter of bad continuity that we can find too often in the Charlie Chan series!
Charlie Chan doesn't drink champagne in Shanghai or at the Race Track, preferring Sasparilla, but he does drink the "bubbly" in Paris.
There is a blooper at the end, dealing with a scene between Russell Hicks as James Andrews and Warner Oland as our Charlie.
Chan is explaining how he knew what happened in a shot of both of them in the frame when the camera cuts to a close up of Hicks by himself. Hicks pushes his hat back on his head and makes a dumb face that doesn't match the next shot of the two of them together!