In the Masonic lodge, they are wearing Craft regalia but set up for another order.
Alan King's gravestone gave his date of birth as 1945 but the plaque for the theatre gave it as 1946.
Charles King tells Ian King, "I have no heir...". This is, in fact, incorrect. While Charles has no children to inherit from him, as Ian's paternal uncle, and as his step-father, Ian is indeed Charles' natural heir. (After his mother, Charles' spouse)