Good on heater bypass.
Good on having the unions installed on pump and filter.
What are the 3 pipes coming from on the suction side that have 2 red valve handles and 1 blue valve handle?
The 3 way valve between the 3 pipes on right and single pipe on right (spa suction ) can be adjusted to various intervals. Right now the valve is shown open to full suction from both spa and pool suction. Normally one pipe will be closed such as full suction from spa or full suction from the pool.
On the return side - the pipe on far right is spa return (with the check valve) and the pipe on left of the 3-way valve is return to pool. I see close to ground there is a Tee with a fitting in it. Do you know what the plan is for that?
Will you have automation? Do you know if the 3-way valve on the suction side and return side will have valve actuators mounted on them?