Hiring managers reveal the 10 most common interview mistakes, and warn candidates that they won't receive the same level of grace as before.

Some unusual behaviors have been observed by hiring managers during the job interview process. A former Amazon recruiter, Lindsay Mustain, received a resume with a picture of the candidate holding a shotgun on the third page. Stefanie Fackrell, a former Nvidia recruiter and current HR consultant, had a candidate tell her they weren't very interested in the job she was interviewing them for.

"Fackrell states that the candidate's choice is not her preferred option, as she is currently waiting for a potential offer from another location."

Hiring managers see more common job interview mistakes that are a bit extreme, according to a recent LinkedIn survey of 1,024 managers.

10 common interview mistakes that job candidates make, according to hiring managers.

• Showing up late to an interview (53%)
• Using foul language or cursing (52%)
• Appearing disinterested or disengaged (51%)
• Looking at your phone during the interview (50%)
• Dressing inappropriately (46%)
• Appearing unprepared to answer basic questions (38%)
• Speaking poorly of previous employers (32%)
• Not asking any questions about the job or company (25%)
• Not having researched the company in advance (21%)
• Not sending a thank you note afterwards (16%)

Drew McCaskill, a LinkedIn career expert, states that showing up on time for an interview is considered bad etiquette.

During the pandemic, hiring managers might have been more lenient to certain behaviors. He recalls, 'We were doing meetings with toddlers on our laps, and we were in sweatpants and yoga clothes.'

As the pandemic has receded, hiring managers now expect candidates to be professional and familiar with workplace protocols, rather than receiving the same level of grace they did before.

With 7.2 million people currently unemployed, hiring managers have a lot of options and a lot of amazing talent to choose from, according to McCaskill.

Employers seek individuals who can excel and contribute to the company's strengths.

To secure your dream job, enroll in CNBC's online course "How to Ace Your Job Interview," which covers what hiring managers truly value, effective body language, smart responses, and pay negotiation strategies.

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