What are some signs that a therapist may have poor boundaries with their clients?

Routinely going over the time limit with certain patients, compromising the time for the next client.

General Introduction to Boundaries from Panahi Counseling:

Obsessing about clients outside of work hours.

Is Veuve Clicquot Brut a good champagne?

Serious disappointment when the client cancels a session.

Frequent phoning or texting of clients to “check up on them and make sure they’re OK.”

Sense of competition with persons who are important in the client’s life.

My friend asked my crush and he said my crush hates me but not in a rude way. What does that mean?

Eager anticipation (or anxious anticipation) of the next session in ways that distract.

These items can happen fleetingly, briefly, in any therapy, but if they’re frequent, it’s definitely time for the therapist to get some good, solid supervision/consultation.

Struggling with fantasies of deeper connections with clients, whether sexual or parental or other intense or intimate relationships beyond psychotherapy.

Why am I tired all the time?

Disclosing feelings, fantasies, and experiences to the client in ways not related to the work the client is engaged in.

Off the top of my ancient head:

Failing to mention the client in supervision/consultation, out of fear the supervisor/consultant will advise return to ordinary healthy boundaries.

Why do many people think that Japan is not a gay-friendly country whereas 72% Japanese support same-sex marriage (the same number as in the US)?

Session-expressed curiosities about client details not relevant to the therapy.