The Disney dub refers several times to the airship as a "dirigible", which is correct, but also as a "blimp", which it isn't; it is a zeppelin, a rigid airship with an internal skeleton that holds it in shape, not a blimp, which is basically a big helium-inflated balloon held in shape by the helium.
English version: A wooden sign in the bakery features the text "Kiki's Delivery Service," in English writing. Later in the film, the same sign is written in Japanese. During the closing credits, the English writing is back.
The four-engined biplane (more precisely, sesquiplane) that Kiki sees during the opening credits is a real aircraft, the Handley-Page HP42. Eight of these planes - the first four-engined aircraft ever built - were commissioned during the 1930s; later they were converted to military use, and all were destroyed by 1941. But since this movie - according to director Hayao Miyazaki - takes place in a world where World War II never happened, it's plausible that the HP42 would still be in civilian service.