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

Serious disappointment when the client cancels a session.

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

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

Why am I so afraid that gun owners have set traps to kill me outside my house or my car?

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.

General Introduction to Boundaries from Panahi Counseling:

Why are you a Muslim? Why is it Islam for you and not something else?

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.

Obsessing about clients outside of work hours.

Why can't ugly women date hot guys? I know a woman who wants a hot BF but people would just laugh at her and ask her "what can you bring to the table for him?", isn't that messed up?

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

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

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

Is it true that most Indian men are gay and they just hide their feelings?

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.