Safety demos
I think that most (all?) airlines use the "recorded" (what is the correct term?) safety demo, when available (typically LH routes, aircraft equipped with individual screens at every seat). I would be curious to know, how often is this demo compromised by the poor quality of the recording? And in these cases, how often it is decided to "fallback" to the traditional "manual" safety demo? I was quite surprised to see one case when this did not happen. (Do I think it matters? I don't know, probably not too much, but...)