"Help" is the process of rendering aid to one who requires it, be it physical, mental educational or spiritual. In the context of this episode, it refers to Buffy Summers' new career path as a guidance counselor.
Xander Harris invokes the phrase "I like Ike". This was a campaign slogan used for supporters of presidential candidate Dwight D. "Ike" Eisenhower from his 1952 campaign.
Xander Harris also invokes the phrase, "Milk, It Does a Body Good". This is taken from a milk commercial produced in 1986 that became quite popular at the time.
Xander Harris: Figuring out how to control your magic seems a lot like hammering a nail. Well, uh, hear me out. So you're hammering, right? If you hold the end of the hammer, you have the power, but no control. It takes, like, two strokes to hit the nail in, or you could hit your thumb.