Technically signs of a 'gaslighter' would just be number 2. Because that is what gaslighting is. However the list presented is a good one for spotting someone with narcissistic personality disorder (who commonly gaslight). It's important to point this out as too many ppl have taken to calling gaslighting a 'trend' (rolls eyes) as if normal ppl do it. Generally they don't - dirsorderd ppl do. Cluster b personality disorders are rife, understudied and untaught about, that is why many ppl fall victim to these sorts.