I guess s/he isn't technically saying something false, but it is a bit deceptive. Why not just use a more genuine ice-breaker? Compliment someone's tie or shoes or ask if they saw the game last night or...1. A person pretends to ask direction in order to get to know someone.
Why make up something specific instead of saying something general instead? "I'm sorry to cut you off, but I really have a lot of work I need to get back to, excuse me." That statement is always true for me, it doesn't hurt people's feelings, and I get on with my day.2. One pretends he or she has an appointment or has something to do in order to end an uncomfortable conversation with someone.
I can't imagine why I would do this. It doesn't have to do with Right Speech in any case. But it sounds devious and probably a bad idea.3. Someone gives impression as if he is looking at something else when he is actually looking at somebody watch.
I wouldn't do this, either. If I felt like answering, I would. If I didn't, I would decline and be frank about why. I think it's worth noting that we can be firm without violating the fourth precept.4. Someone asks personal questions, as a reply we answer "I don't know".
The key to the precepts, and to kamma in general, is intention. Looking at the intentions in the examples above, I see "pretends" in #1, "pretends" in #2, "gives impression" in #3, and so on. Is the intention to speak truthfully or beneficially in any of these cases? If not, why not?
As a side note: when I was new to Buddhism several years ago, I came up with all kinds of hypotheticals like this (some here probably recall, lol). I think it's natural to want to figure it all out and be armed with the right response for every situation that might arise. But I realized eventually that it's unnecessary. If our understanding, intention, and resolve are good, our speech and action will tend to follow suit and we'll instinctively know how to respond to the vast majority of situations that come up.
I hope this helps a little.