Oh, please don't read too much into the fingerpointing. I've worked with kids for a long time, and young children very often go through phases of doing this. Sometimes they are in a stage of language acquisition (that is, they are building their receptive vocabulary, even if they aren't talking yet) and want you to label things. I vividly remember doing this with one little girl in my toddler group, years ago. She was about 23 months and had just started talking beyond "Mama" when she went through a period of pointing at EVERYTHING in our Toddler room. Once we figured out that she didn't want the item, she wanted the name for it, we took 'tours' around the room and gave her language for everything she pointed at. Her expressive language ramped up shortly afterward.
Babies and young toddlers will also point because they want to explore something, to see it up close and have it explained or named. They are interested little learners.
For what it's worth, there are many small traits that fall under "autistic" that many children exhibit. Lining up toys is one, and very common. Autism isn't diagnosed by the exhibition of one trait, but of a combination of traits in several separate domains. This is why children are only diagnosed in this way after having a full evaluation done by a pro.
Hope this offers you some reassurance!
H.