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Boston ferns thrive in tropical and sub-tropical climates, and can be planted year round in hardiness zones 8B-11. They cannot tolerate dropping below the 40 to 50 F. temperature range. That being said, you can either mulch the plant well and hope for the best or overwinter the fern indoors. Here is more info on that: https://www.gardeningknowhow.com/houseplants/boston-fern/overwintering-boston-ferns.htm

What is it you want to know? Is the growth common? Natural? Harmful? Meaningless? Well, to answer all your unasked questions, these growths are called runners, or stolons. They are natural, and can be used to start new ferns. Here's more information: https://www.gardeningknowhow.com/houseplants/boston-fern/boston-fern-runners.htm

This article will give you some good ideas:
https://www.gardeningknowhow.com/plant-problems/pests/animals/birds-in-hanging-baskets.htm

55-75 degrees F is the range of temperatures the Boston fern will survive in but they appreciate 65-75 degrees F the best.

For more information on the care of boston ferns, please visit the following link:
https://www.gardeningknowhow.com/houseplants/boston-fern/boston-fern-care.htm

Yes - over-watering could definitely cause the yellowing you are seeing on your Boston fern. Improper lighting, temperature and humidity could also be to blame - or it may just need to be repotted. I recommend that you review the article below and make amendments where necessary:

https://www.gardeningknowhow.com/houseplants/boston-fern/boston-fern-turning-brown.htm

The plant has pests. There are several it could be, such as aphids, mealybug or scale. All give off a substance called honeydew that will be cleat, sticky and drippy. Treat the plant with a pesticide and this problem should clear up.