The bar sign is spelled "Bistreaux", but the correct word is "bistro", and the plural is 'bistros". Any word that ends in 'eaux' is in the plural form. This is part of the cartoon mocking the French, French culture and the French language, and not necessarily an error.
Pierre is knocked out cold by insecticide, which Deuxdeux refers to as "The DDT's," a clever nod to both DDT and the DT's.
This short was released a year before the first animated Spiderman TV cartoon series, which debuted in 1967 on ABC.
The [Pique Poquette] is a play on the term, "pickpocket".