3 things you need to know about Sunday's Premier League action

What. A. Day.

The four fixtures on Sunday's Premier League agenda produced wild scenes across England. Frank Lampard shattered Chelsea hearts by rescuing a point for Manchester City against his former club. Leicester City inexplicably - well, quite explicably actually - put five goals past Manchester United 2.0. And the table's two bottom dwellers registered their first respective wins of the season.

Here are three things you need to know about Sunday's Premier League action:

Frank Lampard ends Chelsea's perfect start to the season

Who could have guessed that Frank Lampard would be the player to end Chelsea's perfect start to the season?

In a Hollywood script of a match, Manchester City, who were reduced to 10 men following Pablo Zabaleta's second yellow card midway through the second half, escaped with a 1-1 draw against Chelsea after Lampard came off the bench and volleyed home his first goal since moving from Stamford Bridge to the Etihad Stadium.

The match looked to be heading towards Chelsea's fifth consecutive win of the season after Andre Schurrle's tap-in gave Jose Mourinho's side a 1-0 lead in the 71st minute. But with Lampard having the opportunity to make history, perhaps it shouldn't come as a surprise that he rescued a point for City.

Lampard, who also chose against celebrating the goal out of respect for his former club, was understandably emotional after the final whistle.

"It's a tough one," Lampard said. "I had 11 amazing years with Chelsea. I didn't expect to come on and score today. It's a really difficult one. I'd be unprofessional if I came on and didn't do my job so I'm mixed with it. The Chelsea fans were singing my name. It was emotional day. It's not how I expected to say goodbye to the Chelsea fans."

Mourinho, on the other hand, had no time for emotions.

Oh, and don't worry. Lampard and John Terry are still homies.

Leicester City put five past Manchester United

Five goals. Five. Bloody. Goals.

A match that looked to be a certain win for Manchester United took a turn for the worst Sunday. Or, well, a turn for the best if you're a supporter of Leicester City.

After holding a 3-1 lead going into the 62nd minute, United then conceded four goals in the last half-hour of the fixture, allowing newly-promoted Leicester to leave King Power Stadium with a 5-3 win over a side that opened their wallet to the tune of £150.1 million during the summer transfer window.

A penalty from David Nugent made it 3-2. A composed finish from Esteban Cambiasso leveled the score at 3-3. A breakaway involving Jamie Vardy gave Nigel Pearson's side a 4-3 lead. And a penalty from Leonardo Ulloa allowed Leicester to become only the sixth team to ever score five goals against United in a Premier League match.

Of course, such is the case when you only make one tackle between the 60th and 80th minute, the time span during which Leicester pocketed four goals. And if that wasn't bad enough ...

Even Mario Balotelli couldn't help but laugh at Louis van Gaal's misfortune.

West Brom, Crystal Palace earn first wins of the season

Entering Sunday, West Brom and Crystal Palace were sitting at the bottom of the Premier League table as the only clubs with two points.

That's no longer the case, however, as Sunday saw West Brom earn a 1-0 away win versis Tottenham thanks to a late winner from James Morrison, while Palace pulled off a 3-2 victory versus Everton at Goodison Park.

West Brom's win was their first at White Hart Lane in 30 years, but the result shouldn't be all that surprising as Tottenham struggled to create any semblance of a goal-scoring opportunity throughout the match.

Although Everton were slightly more impressive than Tottenham in front of goal, their two goals were rendered meaningless as Palace scored on each of their shots on target.

The result will surely trigger flashbacks of last season, when Palace defeated Everton by the same scoreline and shattered their hopes of reaching the Champions League.

Speaking of which, Palace have been more than impressive on the road as of late.