People always have a certain natural instinct when spotting if they are being lied to. Some people are really good at using those instincts and recognizing the telltale signs. Some people cannot pinpoint those signs quite as well. According to some studies, these instincts are quite strong for everyone, but for some people their conscious mind just grabs those instincts better. To recognize these signs you need to identify how a person would normally act then you will learn to tell the difference when they are lying because there will be certain differences in their body language, facial expressions, speech patterns, etc. that will show if someone is lying.
10. Fidgeting and Fussing
If the person continues doing a random unnecessary action excessively, it might be because they are lying. The action could be cleaning spectacles, fussing over the tablecloth, etc. It might happen more often if the person they are lying to is someone they love. They are less likely to fidget while lying to an unknown person.