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It may be time to repot the Calla Lilies. They may be root bound and not have the soil to support both plants.

Here is a link with more information.

https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/transplanting-calla-lilies.htm

Yes, this is the seed pod. You can simply cut it off or leave it. You can also choose to save the seeds by cutting off the dried seedpod and storing the seeds in an airtight container until ready to plant. Of course, seed grown plants will take much longer to grow and produce flowers. Here is an article that you may find helpful: https://www.gardeningknowhow.com/ornamental/flowers/calla-lily/growing-calla-lilies-and-care-of-calla-lilies.htm

You may have had a pot of mixed bulbs from the start. They are often planted and forced this way in the greenhouses.
They may have not bloomed the first season but now are making an appearance.

We commonly have this question and experience a few times a year from gardeners. Enjoy them! Love the bucket!

Here is a link with more information on Calla Lilies.

https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/green-calla-lily-blooms.htm

This is a naturally occurring event called transpiration. The plant is getting rid of excessive water or moisture that the roots cannot absorb.

Cut back slightly on the watering.

Here is a link to refresh you on the care requirements.

https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/growing-calla-lilies-and-care-of-calla-lilies.htm

If it has already bloomed, you should let it go dormant so you can get more blooms in the future. This article will help:
https://www.gardeningknowhow.com/ornamental/flowers/calla-lily/make-calla-lily-bloom.htm

If buds are not opening fully, they likely need more water. Increase your watering. They should be watered at least daily and twice a day if the temps are over 80 F, especially if they're in containers. You can also add some phosphorus, such as bone meal, to the soil.