illusion, allusion

Illusion or illusion ( ih loozh un ) means something that is pretend, or concocted to fool the eyes or senses--
The magician was an expert at making the illusion seem real.
They kept up the illusion of prosperity by using credit cards for everything.

Allusion or allusion ( uh loozh un ) means a reference to something, usually a literary or artistic work, a myth or a cultural convention, often made in passing or as part of a speech or poem--
They didn't understand the poet's allusion to the ancient myth.
The teacher's allusion to the popular video game helped the students understand the theme of the book.

Now that you know that, you can say--
"His allusion to the popular music video fostered the illusion that he was up on recent trends."

Note--"Allude" is the verb ( action word ) form of "allusion"--
The literature professor tried to allude to Shakespeare's plays at least once each day.