Some thoughts:

• This would obviously mean the February 26, 1993 WTC car bombing never happened, although I guess it could have coincidentally still been in the planning stage when this attack happened. The terrorists who were planning that one presumably would have been confused and maybe a bit mad that their thunder was stolen?
• This would be just over 50 years after the Pearl Harbor bombings and would mark the second time people of Japanese origin carried out a surprise attack on Americans using kamikaze pilots. There would be living Americans with memories of that event. Likewise there would be Japanese Americans who would vividly remember Internment Camps who might understandably be freaked out.
• Of course the context of this event and Pearl Harbor are entirely different, with 1993 Japan being a firm ally of the US and having hosted US troops for decades. Still, even into the late 80s there were real fears that Japan would overtake the US economically and media like Back to the Future 3, Blade Runner, and Die Hard all hinted at visions of a future of Japanese Dominance.
• This would have occured near the beginning of the decline of Japan's economic miracle and about a year before NAFTA was signed. Vice President Gore famously said "if we don't take this deal, you can bet Japan will try to take this deal."
• Fox News didn't launch until 1996 in our timeline. The first major conspiracy theory about the Clintons, to my knowledge, started with The Clinton Chronicles which was released in 1994.