Those are really specific things that you are mentioning and unless you have an eagle eye and have an attention for detail, you are not gunna notice these types of things
They might like you if
IF he/she is looking at you alot
They smile when they look at you
they are lost for words when they talk to you
they laugh a lot when they are around you
they act different than what they normally do.
THEY TALK TO YOU
THEY DON"T MIND BEING AROUND YOU