I'm wondering something that if we can use ''will'' after ''hope'' and ''if''. Normally I thought or rather I learnt we could never use ''will'' after ''hope or if'' but I came across these usages while I was watching tv series that is doctor who (classic one). I know sometimes we could come across grammatical errors in the tv series or movies but I don't think BBC could make a mistake like that. I don't remember in which episode but I'm sure I saw these usages.
So is it okay if we use like that or has that rule changed afterwards? Because that episode of doctor who was released in 1964.