#3 Defensive frailty remains an issue for Bayern Munich
Bayern Munich's defence was cut out time and again by Freiburg, and rather worryingly for the club, this has become a recurring theme.
Petersen's goal meant that Manuel Neuer has not kept a Bundesliga clean sheet since a 5-0 hammering of Frankfurt in October, a run stretching 11 games. In this period, Bayern Munich have conceded 14 goals, which is far from ideal.
Second-division side Holstien Kiel even breached the Bayern Munich rearguard twice in their shock DFB Pokal victory. This defensive porosity has become a major cause of concern for the Bavarian giants.
Had Freiburg converted a late chance at the death, Bayern Munich would have dropped two points.
So far this season, Bayern Munich have conceded 25 goals in just 16 league matches, which is the worst defensive record in the Bundesliga's top six.
For context, 15th-placed Arminia Bielefeld have conceded fewer goals than Hansi Flick's side, while nine sides in the 18-team league have better defensive records than Bayern Munich this campaign.
These are not numbers one generally associates with Bayern Munich, so Hansi Flick will do well to find a solution for the defensive struggles afflicting his side.
#2 Nils Petersen goes from hero to zero
Nils Pedersen showed great instincts to level matters for Freiburg with a well-taken header in the 62nd minute.
The Germany international, who had been on the field for less than two minutes, had a great opportunity to level proceedings one minute into injury time when a clear chance was presented to him in front of goal.
He could, however, only direct his shot against the crossbar when a more clinical finish would have ensured his side left the Allianz Arena with a point.
#1 Unstoppable Robert Lewandwoski gets into the record books yet again
Robert Lewandowski had a record-breaking campaign last season and was the driving force in Bayern Munich's second continental treble-winning campaign.
The 32-year-old hit a career-high 55 goals in all competitions and has justifiably had a clean sweep of individual awards since then. This term, the Poland international seems eager to take his goal-scoring exploits a notch higher, as he has scored at a devastating rate.
His goal against Freiburg was his 21st Bundesliga goal of the season, and it saw him set yet another goal-scoring record.
The strike saw Lewandowski become the first player to score 21 goals in the first half of a Bundesliga season, breaking Gerd Muller's previous record of 20 that had stood for over 40 years.
With over half of the season to go, Robert Lewandowski is on course to break the legendary striker's all-time single season record of 40 goals. At this rate, it will be foolhardy to bet against him doing so.