Couple of points about the Jag: It is not a Series I, it is a Series II, the giveaway being the large, rectangular taillights below the rear bumper. When TC is describing the repairs he made to the car, he says he replaced the fan belt. Series II E-types have no fan belt. They have twin electric fan...

One possible explanation for Agatha's seeming ignorance of Higgins's birthdate is that she knew perfectly well that it wasn't his birthday, but was too well-bred and polite to embarrass Magnum and his friends by pointing it out. It would be perfectly in keeping with her character to do so. It is als...

I believe I know why the dogleg "appeared." That step appears to have been enlarged, necessitating the dogleg. I can only imagine that the reason was that that step was where Higgins frequently stopped to berate Magnum on his awful sax playing, some missing piece of Robin's property, his latest sord...