...speak in a higher pitched voice
...hesitate.

...make speech errors.

...move jerkily.

talk a lot to use up the time.
...get 'emotional' to try and put you off.

...goes along easily if you change the subject.

...avoid eye contact.
...blink more often.

...rub their eyes more
say as little as possible.
...try to get away or change the subject.

...parrot back your words with a denial.

...exaggerate statements about being truthful.
hold the body rigid.
...leak signals then cover up fast.

...smile with the mouth but not the eyes.

...forget to control the lower body (which may twitch).

...send conflicting signals with different parts of the body.
...have eye pupil dilation.

...shrug and grimace.

...give the game away with lower-body signals.

...fidget, with hands and feet.
...repeat the question.
...adjust their clothing.

...ramble on about inconsequential things.

...has slight delays in speech-body alignment
...describe things as if viewing them.
...use less 'I' statements.

...look in a different place (usually up and often up-right) to where we look when remembering (as opposed to constructing) a picture.

...skin gets redder or damper.
...rubbing affected area, particularly palms or the neck.

...appear too relaxed.
...keep a 'frozen face' to avoid leakage.

...hold themselves still with hands and arms.

...stare (blinking less).